256823428 has 12 divisors (see below), whose sum is σ = 468982080. Its totient is φ = 122828552.

The previous prime is 256823419. The next prime is 256823443. The reversal of 256823428 is 824328652.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395688 + ... + 1395871.

It is an arithmetic number, because the mean of its divisors is an integer number (39081840).

Almost surely, 2^256823428 is an apocalyptic number.

It is an amenable number.

256823428 is a deficient number, since it is larger than the sum of its proper divisors (212158652).

256823428 is a wasteful number, since it uses less digits than its factorization.

256823428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791586 (or 2791584 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 256823428 is about 16025.7114662657. The cubic root of 256823428 is about 635.6404788734.

The spelling of 256823428 in words is "two hundred fifty-six million, eight hundred twenty-three thousand, four hundred twenty-eight".