645586404 has 24 divisors (see below), whose sum is σ = 1509607008. Its totient is φ = 214732800.

The previous prime is 645586343. The next prime is 645586423. The reversal of 645586404 is 404685546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51997 + ... + 63204.

It is an arithmetic number, because the mean of its divisors is an integer number (62900292).

Almost surely, 2^645586404 is an apocalyptic number.

It is an amenable number.

645586404 is an abundant number, since it is smaller than the sum of its proper divisors (864020604).

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

645586404 is a wasteful number, since it uses less digits than its factorization.

645586404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115675 (or 115673 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The square root of 645586404 is about 25408.3923930657. The cubic root of 645586404 is about 864.2740203803.

The spelling of 645586404 in words is "six hundred forty-five million, five hundred eighty-six thousand, four hundred four".