256976761 has 8 divisors (see below), whose sum is σ = 262168704. Its totient is φ = 251828640.

The previous prime is 256976711. The next prime is 256976773. The reversal of 256976761 is 167679652.

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

It is a cyclic number.

It is not a de Polignac number, because 256976761 - 2⁷ = 256976633 is a prime.

It is a super-2 number, since 2×256976761² = 132074111388102242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256976711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021 + ... + 22693.

It is an arithmetic number, because the mean of its divisors is an integer number (32771088).

Almost surely, 2^256976761 is an apocalyptic number.

It is an amenable number.

256976761 is a deficient number, since it is larger than the sum of its proper divisors (5191943).

256976761 is a wasteful number, since it uses less digits than its factorization.

256976761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21911.

The product of its digits is 952560, while the sum is 49.

The square root of 256976761 is about 16030.4947209997. The cubic root of 256976761 is about 635.7669539281.

The spelling of 256976761 in words is "two hundred fifty-six million, nine hundred seventy-six thousand, seven hundred sixty-one".