256875887 has 2 divisors, whose sum is σ = 256875888. Its totient is φ = 256875886.

The previous prime is 256875769. The next prime is 256875907. The reversal of 256875887 is 788578652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256875887 - 2¹⁸ = 256613743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256875187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128437943 + 128437944.

It is an arithmetic number, because the mean of its divisors is an integer number (128437944).

Almost surely, 2^256875887 is an apocalyptic number.

256875887 is a deficient number, since it is larger than the sum of its proper divisors (1).

256875887 is an equidigital number, since it uses as much as digits as its factorization.

256875887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7526400, while the sum is 56.

The square root of 256875887 is about 16027.3480963009. The cubic root of 256875887 is about 635.6837547718.

The spelling of 256875887 in words is "two hundred fifty-six million, eight hundred seventy-five thousand, eight hundred eighty-seven".