256990826 has 32 divisors (see below), whose sum is σ = 404088960. Its totient is φ = 122472000.

The previous prime is 256990817. The next prime is 256990831. The reversal of 256990826 is 628099652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1217861 + ... + 1218071.

It is an arithmetic number, because the mean of its divisors is an integer number (12627780).

Almost surely, 2^256990826 is an apocalyptic number.

256990826 is a deficient number, since it is larger than the sum of its proper divisors (147098134).

256990826 is a wasteful number, since it uses less digits than its factorization.

256990826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 256990826 is about 16030.9334101293. The cubic root of 256990826 is about 635.7785527708.

The spelling of 256990826 in words is "two hundred fifty-six million, nine hundred ninety thousand, eight hundred twenty-six".