656425880 has 128 divisors (see below), whose sum is σ = 1684445760. Its totient is φ = 228096000.

The previous prime is 656425859. The next prime is 656425883. The reversal of 656425880 is 88524656.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656425883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 992750 + ... + 993410.

Almost surely, 2^656425880 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 656425880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842222880).

656425880 is an abundant number, since it is smaller than the sum of its proper divisors (1028019880).

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

656425880 is a wasteful number, since it uses less digits than its factorization.

656425880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 44.

The square root of 656425880 is about 25620.8095110205. The cubic root of 656425880 is about 869.0842877559.

The spelling of 656425880 in words is "six hundred fifty-six million, four hundred twenty-five thousand, eight hundred eighty".