256464985 has 8 divisors (see below), whose sum is σ = 351723456. Its totient is φ = 175861680.

The previous prime is 256464979. The next prime is 256464991. The reversal of 256464985 is 589464652.

256464985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256464979) and next prime (256464991).

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

It is not a de Polignac number, because 256464985 - 2⁹ = 256464473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3663751 + ... + 3663820.

It is an arithmetic number, because the mean of its divisors is an integer number (43965432).

Almost surely, 2^256464985 is an apocalyptic number.

It is an amenable number.

256464985 is a deficient number, since it is larger than the sum of its proper divisors (95258471).

256464985 is an equidigital number, since it uses as much as digits as its factorization.

256464985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7327583.

The product of its digits is 2073600, while the sum is 49.

The square root of 256464985 is about 16014.5241889979. The cubic root of 256464985 is about 635.3446245559.

The spelling of 256464985 in words is "two hundred fifty-six million, four hundred sixty-four thousand, nine hundred eighty-five".