625643656 has 128 divisors (see below), whose sum is σ = 1418342400. Its totient is φ = 255467520.

The previous prime is 625643569. The next prime is 625643657. The reversal of 625643656 is 656346526.

It is a super-3 number, since 3×625643656³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (625643657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4926265 + ... + 4926391.

It is an arithmetic number, because the mean of its divisors is an integer number (11080800).

Almost surely, 2^625643656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 625643656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709171200).

625643656 is an abundant number, since it is smaller than the sum of its proper divisors (792698744).

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

625643656 is a wasteful number, since it uses less digits than its factorization.

625643656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 283 counting only the distinct ones).

The product of its digits is 777600, while the sum is 43.

The square root of 625643656 is about 25012.8698073612. The cubic root of 625643656 is about 855.2813756488.

The spelling of 625643656 in words is "six hundred twenty-five million, six hundred forty-three thousand, six hundred fifty-six".