645958752 has 48 divisors (see below), whose sum is σ = 1700455680. Its totient is φ = 214708352.

The previous prime is 645958739. The next prime is 645958763. The reversal of 645958752 is 257859546.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 645958695 and 645958704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25093 + ... + 43835.

It is an arithmetic number, because the mean of its divisors is an integer number (35426160).

Almost surely, 2^645958752 is an apocalyptic number.

It is an amenable number.

645958752 is an abundant number, since it is smaller than the sum of its proper divisors (1054496928).

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

645958752 is a wasteful number, since it uses less digits than its factorization.

645958752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19115 (or 19107 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 51.

The square root of 645958752 is about 25415.7186008974. The cubic root of 645958752 is about 864.4401478223.

The spelling of 645958752 in words is "six hundred forty-five million, nine hundred fifty-eight thousand, seven hundred fifty-two".