645567132 has 48 divisors (see below), whose sum is σ = 1723135232. Its totient is φ = 184273920.

The previous prime is 645567121. The next prime is 645567133. The reversal of 645567132 is 231765546.

645567132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645567133) 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, 105468 + ... + 111420.

Almost surely, 2^645567132 is an apocalyptic number.

It is an amenable number.

645567132 is an abundant number, since it is smaller than the sum of its proper divisors (1077568100).

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

645567132 is a wasteful number, since it uses less digits than its factorization.

645567132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7256 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 645567132 is about 25408.0131454626. The cubic root of 645567132 is about 864.2654202123.

The spelling of 645567132 in words is "six hundred forty-five million, five hundred sixty-seven thousand, one hundred thirty-two".