256977575 has 6 divisors (see below), whose sum is σ = 318652224. Its totient is φ = 205582040.

The previous prime is 256977571. The next prime is 256977601. The reversal of 256977575 is 575779652.

It is not a de Polignac number, because 256977575 - 2² = 256977571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256977571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5139527 + ... + 5139576.

It is an arithmetic number, because the mean of its divisors is an integer number (53108704).

Almost surely, 2^256977575 is an apocalyptic number.

256977575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256977575 is a deficient number, since it is larger than the sum of its proper divisors (61674649).

256977575 is a wasteful number, since it uses less digits than its factorization.

256977575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279113 (or 10279108 counting only the distinct ones).

The product of its digits is 4630500, while the sum is 53.

The square root of 256977575 is about 16030.5201100900. The cubic root of 256977575 is about 635.7676252128.

The spelling of 256977575 in words is "two hundred fifty-six million, nine hundred seventy-seven thousand, five hundred seventy-five".