256424365 has 4 divisors (see below), whose sum is σ = 307709244. Its totient is φ = 205139488.

The previous prime is 256424347. The next prime is 256424383. The reversal of 256424365 is 563424652.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256424347) and next prime (256424383).

It can be written as a sum of positive squares in 2 ways, for example, as 192071881 + 64352484 = 13859^2 + 8022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256424365 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25642432 + ... + 25642441.

It is an arithmetic number, because the mean of its divisors is an integer number (76927311).

Almost surely, 2^256424365 is an apocalyptic number.

It is an amenable number.

256424365 is a deficient number, since it is larger than the sum of its proper divisors (51284879).

256424365 is an equidigital number, since it uses as much as digits as its factorization.

256424365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51284878.

The product of its digits is 172800, while the sum is 37.

The square root of 256424365 is about 16013.2559150224. The cubic root of 256424365 is about 635.3110799361.

The spelling of 256424365 in words is "two hundred fifty-six million, four hundred twenty-four thousand, three hundred sixty-five".