656710438 has 4 divisors (see below), whose sum is σ = 985065660. Its totient is φ = 328355218.

The previous prime is 656710393. The next prime is 656710451. The reversal of 656710438 is 834017656.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 656710438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164177608 + ... + 164177611.

It is an arithmetic number, because the mean of its divisors is an integer number (246266415).

Almost surely, 2^656710438 is an apocalyptic number.

656710438 is a deficient number, since it is larger than the sum of its proper divisors (328355222).

656710438 is a wasteful number, since it uses less digits than its factorization.

656710438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328355221.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 656710438 is about 25626.3621686731. The cubic root of 656710438 is about 869.2098511377.

The spelling of 656710438 in words is "six hundred fifty-six million, seven hundred ten thousand, four hundred thirty-eight".