645624576 has 54 divisors (see below), whose sum is σ = 1861501460. Its totient is φ = 215207424.

The previous prime is 645624563. The next prime is 645624607. The reversal of 645624576 is 675426546.

645624576 is a `hidden beast` number, since 6 + 4 + 56 + 24 + 576 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137806 + ... + 142413.

Almost surely, 2^645624576 is an apocalyptic number.

It is an amenable number.

645624576 is an abundant number, since it is smaller than the sum of its proper divisors (1215876884).

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

645624576 is a wasteful number, since it uses less digits than its factorization.

645624576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280241 (or 280224 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The square root of 645624576 is about 25409.1435510920. The cubic root of 645624576 is about 864.2910542054.

The spelling of 645624576 in words is "six hundred forty-five million, six hundred twenty-four thousand, five hundred seventy-six".