256990892 has 6 divisors (see below), whose sum is σ = 449734068. Its totient is φ = 128495444.

The previous prime is 256990861. The next prime is 256990897. The reversal of 256990892 is 298099652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256990892.

It is not an unprimeable number, because it can be changed into a prime (256990897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32123858 + ... + 32123865.

It is an arithmetic number, because the mean of its divisors is an integer number (74955678).

Almost surely, 2^256990892 is an apocalyptic number.

It is an amenable number.

256990892 is a deficient number, since it is larger than the sum of its proper divisors (192743176).

256990892 is a wasteful number, since it uses less digits than its factorization.

256990892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64247727 (or 64247725 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 256990892 is about 16030.9354686494. The cubic root of 256990892 is about 635.7786071973.

The spelling of 256990892 in words is "two hundred fifty-six million, nine hundred ninety thousand, eight hundred ninety-two".