256400635 has 8 divisors (see below), whose sum is σ = 307866240. Its totient is φ = 204996864.

The previous prime is 256400609. The next prime is 256400653. The reversal of 256400635 is 536004652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256400635 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256400597 and 256400606.

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 in 7 ways as a sum of consecutive naturals, for example, 5782 + ... + 23371.

It is an arithmetic number, because the mean of its divisors is an integer number (38483280).

Almost surely, 2^256400635 is an apocalyptic number.

256400635 is a deficient number, since it is larger than the sum of its proper divisors (51465605).

256400635 is a wasteful number, since it uses less digits than its factorization.

256400635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30917.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 256400635 is about 16012.5149492514. The cubic root of 256400635 is about 635.2914816983.

The spelling of 256400635 in words is "two hundred fifty-six million, four hundred thousand, six hundred thirty-five".