256973887 has 12 divisors (see below), whose sum is σ = 274986040. Its totient is φ = 240080256.

The previous prime is 256973869. The next prime is 256973909. The reversal of 256973887 is 788379652.

It is not a de Polignac number, because 256973887 - 2¹¹ = 256971839 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 (256970887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36973 + ... + 43369.

Almost surely, 2^256973887 is an apocalyptic number.

256973887 is a deficient number, since it is larger than the sum of its proper divisors (18012153).

256973887 is a wasteful number, since it uses less digits than its factorization.

256973887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570 (or 6553 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 55.

The square root of 256973887 is about 16030.4050790989. The cubic root of 256973887 is about 635.7645838032.

It can be divided in two parts, 25697 and 3887, that added together give a square (29584 = 172²).

The spelling of 256973887 in words is "two hundred fifty-six million, nine hundred seventy-three thousand, eight hundred eighty-seven".