656629254 has 128 divisors (see below), whose sum is σ = 1581327360. Its totient is φ = 204003360.

The previous prime is 656629217. The next prime is 656629261. The reversal of 656629254 is 452926656.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6136669 + ... + 6136775.

It is an arithmetic number, because the mean of its divisors is an integer number (12354120).

Almost surely, 2^656629254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656629254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790663680).

656629254 is an abundant number, since it is smaller than the sum of its proper divisors (924698106).

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

656629254 is a wasteful number, since it uses less digits than its factorization.

656629254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 196 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 656629254 is about 25624.7781258687. The cubic root of 656629254 is about 869.1740317788.

The spelling of 656629254 in words is "six hundred fifty-six million, six hundred twenty-nine thousand, two hundred fifty-four".