656890434 has 24 divisors (see below), whose sum is σ = 1469175552. Its totient is φ = 211899960.

The previous prime is 656890433. The next prime is 656890453. The reversal of 656890434 is 434098656.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 656890434.

It is not an unprimeable number, because it can be changed into a prime (656890433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 588054 + ... + 589169.

It is an arithmetic number, because the mean of its divisors is an integer number (61215648).

Almost surely, 2^656890434 is an apocalyptic number.

656890434 is an abundant number, since it is smaller than the sum of its proper divisors (812285118).

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

656890434 is a wasteful number, since it uses less digits than its factorization.

656890434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177262 (or 1177259 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 656890434 is about 25629.8738584489. The cubic root of 656890434 is about 869.2892570146.

The spelling of 656890434 in words is "six hundred fifty-six million, eight hundred ninety thousand, four hundred thirty-four".