256495587 has 8 divisors (see below), whose sum is σ = 342068304. Its totient is φ = 170959968.

The previous prime is 256495553. The next prime is 256495607. The reversal of 256495587 is 785594652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256495587 - 2⁸ = 256495331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256495537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20733 + ... + 30705.

It is an arithmetic number, because the mean of its divisors is an integer number (42758538).

Almost surely, 2^256495587 is an apocalyptic number.

256495587 is a deficient number, since it is larger than the sum of its proper divisors (85572717).

256495587 is an equidigital number, since it uses as much as digits as its factorization.

256495587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18549.

The product of its digits is 3024000, while the sum is 51.

The square root of 256495587 is about 16015.4796056815. The cubic root of 256495587 is about 635.3698938182.

The spelling of 256495587 in words is "two hundred fifty-six million, four hundred ninety-five thousand, five hundred eighty-seven".