645083744 has 24 divisors (see below), whose sum is σ = 1336852440. Its totient is φ = 305565696.

The previous prime is 645083713. The next prime is 645083771. The reversal of 645083744 is 447380546.

It is a super-2 number, since 2×645083744² = 832266073546115072, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 529889 + ... + 531104.

It is an arithmetic number, because the mean of its divisors is an integer number (55702185).

Almost surely, 2^645083744 is an apocalyptic number.

It is an amenable number.

645083744 is an abundant number, since it is smaller than the sum of its proper divisors (691768696).

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

645083744 is a wasteful number, since it uses less digits than its factorization.

645083744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061022 (or 1061014 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 41.

The square root of 645083744 is about 25398.4988532787. The cubic root of 645083744 is about 864.0496513533.

The spelling of 645083744 in words is "six hundred forty-five million, eighty-three thousand, seven hundred forty-four".