256635402 has 8 divisors (see below), whose sum is σ = 513270816. Its totient is φ = 85545132.

The previous prime is 256635397. The next prime is 256635409. The reversal of 256635402 is 204536652.

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

256635402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (256635409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21386278 + ... + 21386289.

It is an arithmetic number, because the mean of its divisors is an integer number (64158852).

Almost surely, 2^256635402 is an apocalyptic number.

256635402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256635402 is a wasteful number, since it uses less digits than its factorization.

256635402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42772572.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 256635402 is about 16019.8440067312. The cubic root of 256635402 is about 635.4853189431.

The spelling of 256635402 in words is "two hundred fifty-six million, six hundred thirty-five thousand, four hundred two".