656787434 has 4 divisors (see below), whose sum is σ = 985181154. Its totient is φ = 328393716.

The previous prime is 656787413. The next prime is 656787451. The reversal of 656787434 is 434787656.

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

It can be written as a sum of positive squares in only one way, i.e., 554838025 + 101949409 = 23555^2 + 10097^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164196857 + ... + 164196860.

Almost surely, 2^656787434 is an apocalyptic number.

656787434 is a deficient number, since it is larger than the sum of its proper divisors (328393720).

656787434 is a wasteful number, since it uses less digits than its factorization.

656787434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328393719.

The product of its digits is 3386880, while the sum is 50.

The square root of 656787434 is about 25627.8644057596. The cubic root of 656787434 is about 869.2438199731.

The spelling of 656787434 in words is "six hundred fifty-six million, seven hundred eighty-seven thousand, four hundred thirty-four".