656494938 has 72 divisors (see below), whose sum is σ = 1569544704. Its totient is φ = 198166320.

The previous prime is 656494903. The next prime is 656494939. The reversal of 656494938 is 839494656.

656494938 is a `hidden beast` number, since 6 + 564 + 9 + 49 + 38 = 666.

It is not an unprimeable number, because it can be changed into a prime (656494939) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 833781 + ... + 834567.

It is an arithmetic number, because the mean of its divisors is an integer number (21799232).

Almost surely, 2^656494938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656494938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784772352).

656494938 is an abundant number, since it is smaller than the sum of its proper divisors (913049766).

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

656494938 is a wasteful number, since it uses less digits than its factorization.

656494938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200 (or 1186 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 656494938 is about 25622.1571691378. The cubic root of 656494938 is about 869.1147634578.

It can be divided in two parts, 656 and 494938, that added together give a palindrome (495594).

The spelling of 656494938 in words is "six hundred fifty-six million, four hundred ninety-four thousand, nine hundred thirty-eight".