656356220 has 48 divisors (see below), whose sum is σ = 1492259328. Its totient is φ = 241059840.

The previous prime is 656356073. The next prime is 656356229. The reversal of 656356220 is 22653656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656356229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43052 + ... + 56268.

It is an arithmetic number, because the mean of its divisors is an integer number (31088736).

Almost surely, 2^656356220 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 656356220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746129664).

656356220 is an abundant number, since it is smaller than the sum of its proper divisors (835903108).

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

656356220 is a wasteful number, since it uses less digits than its factorization.

656356220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13430 (or 13428 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 656356220 is about 25619.4500331291. The cubic root of 656356220 is about 869.0535442224.

The spelling of 656356220 in words is "six hundred fifty-six million, three hundred fifty-six thousand, two hundred twenty".