656137244 has 72 divisors (see below), whose sum is σ = 1379116368. Its totient is φ = 272213760.

The previous prime is 656137217. The next prime is 656137247. The reversal of 656137244 is 442731656.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 656137198 and 656137207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656137247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 861824 + ... + 862584.

It is an arithmetic number, because the mean of its divisors is an integer number (19154394).

Almost surely, 2^656137244 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 656137244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689558184).

656137244 is an abundant number, since it is smaller than the sum of its proper divisors (722979124).

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

656137244 is a wasteful number, since it uses less digits than its factorization.

656137244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 906 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 656137244 is about 25615.1760485849. The cubic root of 656137244 is about 868.9568878489.

The spelling of 656137244 in words is "six hundred fifty-six million, one hundred thirty-seven thousand, two hundred forty-four".