645629888 has 28 divisors (see below), whose sum is σ = 1305351720. Its totient is φ = 316722432.

The previous prime is 645629869. The next prime is 645629891. The reversal of 645629888 is 888926546.

645629888 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, 91778 + ... + 98561.

Almost surely, 2^645629888 is an apocalyptic number.

It is an amenable number.

645629888 is an abundant number, since it is smaller than the sum of its proper divisors (659721832).

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

645629888 is a wasteful number, since it uses less digits than its factorization.

645629888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190404 (or 190394 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The square root of 645629888 is about 25409.2480801774. The cubic root of 645629888 is about 864.2934245724.

The spelling of 645629888 in words is "six hundred forty-five million, six hundred twenty-nine thousand, eight hundred eighty-eight".