656343140 has 48 divisors (see below), whose sum is σ = 1484179200. Its totient is φ = 242898432.

The previous prime is 656343119. The next prime is 656343169. The reversal of 656343140 is 41343656.

It is a junction number, because it is equal to n+sod(n) for n = 656343097 and 656343106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3701 + ... + 36419.

It is an arithmetic number, because the mean of its divisors is an integer number (30920400).

Almost surely, 2^656343140 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 656343140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742089600).

656343140 is an abundant number, since it is smaller than the sum of its proper divisors (827836060).

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

656343140 is a wasteful number, since it uses less digits than its factorization.

656343140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32804 (or 32802 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 656343140 is about 25619.1947570567. The cubic root of 656343140 is about 869.0477712922.

Adding to 656343140 its reverse (41343656), we get a palindrome (697686796).

The spelling of 656343140 in words is "six hundred fifty-six million, three hundred forty-three thousand, one hundred forty".