645692512 has 24 divisors (see below), whose sum is σ = 1273090392. Its totient is φ = 322368000.

The previous prime is 645692507. The next prime is 645692539. The reversal of 645692512 is 215296546.

645692512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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, 7512 + ... + 36712.

It is an arithmetic number, because the mean of its divisors is an integer number (53045433).

Almost surely, 2^645692512 is an apocalyptic number.

It is an amenable number.

645692512 is a deficient number, since it is larger than the sum of its proper divisors (627397880).

645692512 is a wasteful number, since it uses less digits than its factorization.

645692512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29902 (or 29894 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 645692512 is about 25410.4803575218. The cubic root of 645692512 is about 864.3213682196.

It can be divided in two parts, 64569 and 2512, that added together give a square (67081 = 259²).

The spelling of 645692512 in words is "six hundred forty-five million, six hundred ninety-two thousand, five hundred twelve".