256811502 has 16 divisors (see below), whose sum is σ = 530191872. Its totient is φ = 82842360.

The previous prime is 256811497. The next prime is 256811519. The reversal of 256811502 is 205118652.

It is a self number, because there is not a number n which added to its sum of digits gives 256811502.

It is a congruent 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 in 7 ways as a sum of consecutive naturals, for example, 690168 + ... + 690539.

It is an arithmetic number, because the mean of its divisors is an integer number (33136992).

Almost surely, 2^256811502 is an apocalyptic number.

256811502 is an abundant number, since it is smaller than the sum of its proper divisors (273380370).

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

256811502 is a wasteful number, since it uses less digits than its factorization.

256811502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380743.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 256811502 is about 16025.3393723815. The cubic root of 256811502 is about 635.6306397325.

The spelling of 256811502 in words is "two hundred fifty-six million, eight hundred eleven thousand, five hundred two".