625686164 has 12 divisors (see below), whose sum is σ = 1102300500. Its totient is φ = 310743168.

The previous prime is 625686161. The next prime is 625686179. The reversal of 625686164 is 461686526.

It can be written as a sum of positive squares in 2 ways, for example, as 362597764 + 263088400 = 19042^2 + 16220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625686161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524309 + ... + 525500.

It is an arithmetic number, because the mean of its divisors is an integer number (91858375).

Almost surely, 2^625686164 is an apocalyptic number.

It is an amenable number.

625686164 is a deficient number, since it is larger than the sum of its proper divisors (476614336).

625686164 is a wasteful number, since it uses less digits than its factorization.

625686164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049962 (or 1049960 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 625686164 is about 25013.7195154979. The cubic root of 625686164 is about 855.3007452889.

The spelling of 625686164 in words is "six hundred twenty-five million, six hundred eighty-six thousand, one hundred sixty-four".