656393790 has 64 divisors (see below), whose sum is σ = 1699891200. Its totient is φ = 161253504.

The previous prime is 656393767. The next prime is 656393807. The reversal of 656393790 is 97393656.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240051 + ... + 242769.

It is an arithmetic number, because the mean of its divisors is an integer number (26560800).

Almost surely, 2^656393790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656393790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849945600).

656393790 is an abundant number, since it is smaller than the sum of its proper divisors (1043497410).

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

656393790 is a wasteful number, since it uses less digits than its factorization.

656393790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361.

The product of its (nonzero) digits is 918540, while the sum is 48.

The square root of 656393790 is about 25620.1832546139. The cubic root of 656393790 is about 869.0701255227.

The spelling of 656393790 in words is "six hundred fifty-six million, three hundred ninety-three thousand, seven hundred ninety".