1645522140 has 96 divisors (see below), whose sum is σ = 4890715200. Its totient is φ = 411959296.

The previous prime is 1645522139. The next prime is 1645522183. The reversal of 1645522140 is 412255461.

It is a super-2 number, since 2×1645522140² = 5415486226460359200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1645522098 and 1645522107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456184 + ... + 459776.

It is an arithmetic number, because the mean of its divisors is an integer number (50944950).

Almost surely, 2^1645522140 is an apocalyptic number.

1645522140 is a gapful number since it is divisible by the number (10) 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 1645522140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2445357600).

1645522140 is an abundant number, since it is smaller than the sum of its proper divisors (3245193060).

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

1645522140 is a wasteful number, since it uses less digits than its factorization.

1645522140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071 (or 4069 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1645522140 is about 40565.0359299730. The cubic root of 1645522140 is about 1180.5958256869.

The spelling of 1645522140 in words is "one billion, six hundred forty-five million, five hundred twenty-two thousand, one hundred forty".