256628612 has 6 divisors (see below), whose sum is σ = 449100078. Its totient is φ = 128314304.

The previous prime is 256628587. The next prime is 256628639. The reversal of 256628612 is 216826652.

It can be written as a sum of positive squares in only one way, i.e., 240436036 + 16192576 = 15506^2 + 4024^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078573 + ... + 32078580.

It is an arithmetic number, because the mean of its divisors is an integer number (74850013).

Almost surely, 2^256628612 is an apocalyptic number.

It is an amenable number.

256628612 is a deficient number, since it is larger than the sum of its proper divisors (192471466).

256628612 is a wasteful number, since it uses less digits than its factorization.

256628612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64157157 (or 64157155 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 256628612 is about 16019.6320806690. The cubic root of 256628612 is about 635.4797143859.

The spelling of 256628612 in words is "two hundred fifty-six million, six hundred twenty-eight thousand, six hundred twelve".