656040140 has 48 divisors (see below), whose sum is σ = 1586559744. Its totient is φ = 223204800.

The previous prime is 656040103. The next prime is 656040157. The reversal of 656040140 is 41040656.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455 + ... + 36225.

It is an arithmetic number, because the mean of its divisors is an integer number (33053328).

Almost surely, 2^656040140 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 656040140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793279872).

656040140 is an abundant number, since it is smaller than the sum of its proper divisors (930519604).

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

656040140 is a wasteful number, since it uses less digits than its factorization.

656040140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35918 (or 35916 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 656040140 is about 25613.2805395951. The cubic root of 656040140 is about 868.9140190978.

Adding to 656040140 its reverse (41040656), we get a palindrome (697080796).

The spelling of 656040140 in words is "six hundred fifty-six million, forty thousand, one hundred forty".