256132857 has 8 divisors (see below), whose sum is σ = 341778976. Its totient is φ = 170620992.

The previous prime is 256132847. The next prime is 256132859. The reversal of 256132857 is 758231652.

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

It is not a de Polignac number, because 256132857 - 2⁴ = 256132841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256132859) 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, 29023 + ... + 36804.

It is an arithmetic number, because the mean of its divisors is an integer number (42722372).

Almost surely, 2^256132857 is an apocalyptic number.

It is an amenable number.

256132857 is a deficient number, since it is larger than the sum of its proper divisors (85646119).

256132857 is a wasteful number, since it uses less digits than its factorization.

256132857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67127.

The product of its digits is 100800, while the sum is 39.

The square root of 256132857 is about 16004.1512427245. The cubic root of 256132857 is about 635.0702441564.

The spelling of 256132857 in words is "two hundred fifty-six million, one hundred thirty-two thousand, eight hundred fifty-seven".