256057856 has 20 divisors (see below), whose sum is σ = 511616622. Its totient is φ = 128028672.

The previous prime is 256057843. The next prime is 256057883. The reversal of 256057856 is 658750652.

It can be written as a sum of positive squares in only one way, i.e., 253446400 + 2611456 = 15920^2 + 1616^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249545 + ... + 250568.

Almost surely, 2^256057856 is an apocalyptic number.

It is an amenable number.

256057856 is a deficient number, since it is larger than the sum of its proper divisors (255558766).

256057856 is an frugal number, since it uses more digits than its factorization.

256057856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500131 (or 500115 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 256057856 is about 16001.8078978595. The cubic root of 256057856 is about 635.0082508693.

The spelling of 256057856 in words is "two hundred fifty-six million, fifty-seven thousand, eight hundred fifty-six".