256253487 has 12 divisors (see below), whose sum is σ = 397454616. Its totient is φ = 146430480.

The previous prime is 256253479. The next prime is 256253489. The reversal of 256253487 is 784352652.

It is not a de Polignac number, because 256253487 - 2³ = 256253479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256253489) 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, 871464 + ... + 871757.

It is an arithmetic number, because the mean of its divisors is an integer number (33121218).

Almost surely, 2^256253487 is an apocalyptic number.

256253487 is a deficient number, since it is larger than the sum of its proper divisors (141201129).

256253487 is a wasteful number, since it uses less digits than its factorization.

256253487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743238 (or 1743231 counting only the distinct ones).

The product of its digits is 403200, while the sum is 42.

The square root of 256253487 is about 16007.9195087931. The cubic root of 256253487 is about 635.1699274496.

The spelling of 256253487 in words is "two hundred fifty-six million, two hundred fifty-three thousand, four hundred eighty-seven".