656836938 has 80 divisors (see below), whose sum is σ = 1513378944. Its totient is φ = 212829120.

The previous prime is 656836931. The next prime is 656836969. The reversal of 656836938 is 839638656.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (5598720) is a multiple of the sum of its prime divisors (640).

It is not an unprimeable number, because it can be changed into a prime (656836931) 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 39 ways as a sum of consecutive naturals, for example, 2139381 + ... + 2139687.

Almost surely, 2^656836938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656836938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756689472).

656836938 is an abundant number, since it is smaller than the sum of its proper divisors (856542006).

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

656836938 is a wasteful number, since it uses less digits than its factorization.

656836938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 640 counting only the distinct ones).

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

The square root of 656836938 is about 25628.8302113070. The cubic root of 656836938 is about 869.2656585786.

The spelling of 656836938 in words is "six hundred fifty-six million, eight hundred thirty-six thousand, nine hundred thirty-eight".