256776828 has 48 divisors (see below), whose sum is σ = 746989824. Its totient is φ = 66695040.

The previous prime is 256776803. The next prime is 256776829. The reversal of 256776828 is 828677652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256776829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138025 + ... + 139872.

It is an arithmetic number, because the mean of its divisors is an integer number (15562288).

Almost surely, 2^256776828 is an apocalyptic number.

256776828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256776828 is an abundant number, since it is smaller than the sum of its proper divisors (490212996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256776828 is a wasteful number, since it uses less digits than its factorization.

256776828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277922 (or 277920 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 256776828 is about 16024.2574866981. The cubic root of 256776828 is about 635.6020313970.

The spelling of 256776828 in words is "two hundred fifty-six million, seven hundred seventy-six thousand, eight hundred twenty-eight".