645800408 has 16 divisors (see below), whose sum is σ = 1320955560. Its totient is φ = 293545600.

The previous prime is 645800347. The next prime is 645800447. The reversal of 645800408 is 804008546.

645800408 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669233 + ... + 3669408.

Almost surely, 2^645800408 is an apocalyptic number.

It is an amenable number.

645800408 is an abundant number, since it is smaller than the sum of its proper divisors (675155152).

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

645800408 is a wasteful number, since it uses less digits than its factorization.

645800408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7338658 (or 7338654 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 645800408 is about 25412.6033298440. The cubic root of 645800408 is about 864.3695085871.

The spelling of 645800408 in words is "six hundred forty-five million, eight hundred thousand, four hundred eight".