645028016 has 20 divisors (see below), whose sum is σ = 1262118624. Its totient is φ = 319320000.

The previous prime is 645028009. The next prime is 645028037. The reversal of 645028016 is 610820546.

It is a super-2 number, since 2×645028016² = 832122282849792512, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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, 197960 + ... + 201191.

Almost surely, 2^645028016 is an apocalyptic number.

It is an amenable number.

645028016 is a deficient number, since it is larger than the sum of its proper divisors (617090608).

645028016 is a wasteful number, since it uses less digits than its factorization.

645028016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399260 (or 399254 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 645028016 is about 25397.4017568727. The cubic root of 645028016 is about 864.0247692373.

The spelling of 645028016 in words is "six hundred forty-five million, twenty-eight thousand, sixteen".