256080891 has 24 divisors (see below), whose sum is σ = 377313552. Its totient is φ = 154369600.

The previous prime is 256080889. The next prime is 256080899. The reversal of 256080891 is 198080652.

256080891 = T₆₈₁₈ + T₆₈₁₉ + ... + T₆₈₂₈.

It is not a de Polignac number, because 256080891 - 2¹ = 256080889 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256080899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69721 + ... + 73301.

It is an arithmetic number, because the mean of its divisors is an integer number (15721398).

Almost surely, 2^256080891 is an apocalyptic number.

256080891 is a deficient number, since it is larger than the sum of its proper divisors (121232661).

256080891 is a wasteful number, since it uses less digits than its factorization.

256080891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803 (or 3792 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 256080891 is about 16002.5276440942. The cubic root of 256080891 is about 635.0272921082.

The spelling of 256080891 in words is "two hundred fifty-six million, eighty thousand, eight hundred ninety-one".