1645240032 has 96 divisors (see below), whose sum is σ = 4806496800. Its totient is φ = 547513344.

The previous prime is 1645240031. The next prime is 1645240033. The reversal of 1645240032 is 2300425461.

It is an interprime number because it is at equal distance from previous prime (1645240031) and next prime (1645240033).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1645240032² = 5413629525790722048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1645239978 and 1645240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645240031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715108 + ... + 717404.

It is an arithmetic number, because the mean of its divisors is an integer number (50067675).

Almost surely, 2^1645240032 is an apocalyptic number.

1645240032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645240032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2403248400).

1645240032 is an abundant number, since it is smaller than the sum of its proper divisors (3161256768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645240032 is a wasteful number, since it uses less digits than its factorization.

1645240032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145 (or 3131 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1645240032 is about 40561.5585499374. The cubic root of 1645240032 is about 1180.5283547904.

Adding to 1645240032 its reverse (2300425461), we get a palindrome (3945665493).

The spelling of 1645240032 in words is "one billion, six hundred forty-five million, two hundred forty thousand, thirty-two".