645545032 has 32 divisors (see below), whose sum is σ = 1322788320. Its totient is φ = 292906240.

The previous prime is 645545027. The next prime is 645545039. The reversal of 645545032 is 230545546.

It is not an unprimeable number, because it can be changed into a prime (645545039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45408 + ... + 57904.

It is an arithmetic number, because the mean of its divisors is an integer number (41337135).

Almost surely, 2^645545032 is an apocalyptic number.

It is an amenable number.

645545032 is an abundant number, since it is smaller than the sum of its proper divisors (677243288).

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

645545032 is a wasteful number, since it uses less digits than its factorization.

645545032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13101 (or 13097 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 645545032 is about 25407.5782395725. The cubic root of 645545032 is about 864.2555578330.

The spelling of 645545032 in words is "six hundred forty-five million, five hundred forty-five thousand, thirty-two".