1645535232 has 168 divisors, whose sum is σ = 5188168440. Its totient is φ = 498401280.

The previous prime is 1645535231. The next prime is 1645535233. The reversal of 1645535232 is 2325355461.

1645535232 is a `hidden beast` number, since 1 + 645 + 5 + 3 + 5 + 2 + 3 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1645535231) and next prime (1645535233).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645535231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 809994 + ... + 812022.

It is an arithmetic number, because the mean of its divisors is an integer number (30881955).

Almost surely, 2^1645535232 is an apocalyptic number.

1645535232 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 1645535232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594084220).

1645535232 is an abundant number, since it is smaller than the sum of its proper divisors (3542633208).

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

1645535232 is a wasteful number, since it uses less digits than its factorization.

1645535232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2045 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 1645535232 is about 40565.1973001488. The cubic root of 1645535232 is about 1180.5989566727.

The spelling of 1645535232 in words is "one billion, six hundred forty-five million, five hundred thirty-five thousand, two hundred thirty-two".