645570604 has 24 divisors (see below), whose sum is σ = 1291865120. Its totient is φ = 276518016.

The previous prime is 645570593. The next prime is 645570617. The reversal of 645570604 is 406075546.

It is a happy number.

It is a super-2 number, since 2×645570604² = 833522809497849632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54442 + ... + 65230.

Almost surely, 2^645570604 is an apocalyptic number.

It is an amenable number.

645570604 is an abundant number, since it is smaller than the sum of its proper divisors (646294516).

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

645570604 is a wasteful number, since it uses less digits than its factorization.

645570604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12937 (or 12935 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 645570604 is about 25408.0814702724. The cubic root of 645570604 is about 864.2669696118.

The spelling of 645570604 in words is "six hundred forty-five million, five hundred seventy thousand, six hundred four".