256828899 has 4 divisors (see below), whose sum is σ = 342438536. Its totient is φ = 171219264.

The previous prime is 256828883. The next prime is 256828967. The reversal of 256828899 is 998828652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 256828899 - 2⁴ = 256828883 is a prime.

It is a super-2 number, since 2×256828899² = 131922166723104402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256828399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42804814 + ... + 42804819.

It is an arithmetic number, because the mean of its divisors is an integer number (85609634).

Almost surely, 2^256828899 is an apocalyptic number.

256828899 is a deficient number, since it is larger than the sum of its proper divisors (85609637).

256828899 is an equidigital number, since it uses as much as digits as its factorization.

256828899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85609636.

The product of its digits is 4976640, while the sum is 57.

The square root of 256828899 is about 16025.8821598064. The cubic root of 256828899 is about 635.6449924340.

The spelling of 256828899 in words is "two hundred fifty-six million, eight hundred twenty-eight thousand, eight hundred ninety-nine".