645907475 has 12 divisors (see below), whose sum is σ = 826762560. Its totient is φ = 500056800.

The previous prime is 645907393. The next prime is 645907477. The reversal of 645907475 is 574709546.

It is not a de Polignac number, because 645907475 - 2²⁰ = 644858899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645907477) 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, 415940 + ... + 417489.

It is an arithmetic number, because the mean of its divisors is an integer number (68896880).

Almost surely, 2^645907475 is an apocalyptic number.

645907475 is a deficient number, since it is larger than the sum of its proper divisors (180855085).

645907475 is a wasteful number, since it uses less digits than its factorization.

645907475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833470 (or 833465 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The square root of 645907475 is about 25414.7098153805. The cubic root of 645907475 is about 864.4172737764.

The spelling of 645907475 in words is "six hundred forty-five million, nine hundred seven thousand, four hundred seventy-five".