656129796 has 72 divisors (see below), whose sum is σ = 1811204640. Its totient is φ = 184278528.

The previous prime is 656129783. The next prime is 656129797. The reversal of 656129796 is 697921656.

It is not an unprimeable number, because it can be changed into a prime (656129797) 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, 25236 + ... + 44148.

It is an arithmetic number, because the mean of its divisors is an integer number (25155620).

Almost surely, 2^656129796 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 656129796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905602320).

656129796 is an abundant number, since it is smaller than the sum of its proper divisors (1155074844).

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

656129796 is a wasteful number, since it uses less digits than its factorization.

656129796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18993 (or 18984 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 656129796 is about 25615.0306656073. The cubic root of 656129796 is about 868.9535999111.

The spelling of 656129796 in words is "six hundred fifty-six million, one hundred twenty-nine thousand, seven hundred ninety-six".