256412633 has 4 divisors (see below), whose sum is σ = 257052468. Its totient is φ = 255772800.

The previous prime is 256412623. The next prime is 256412669. The reversal of 256412633 is 336214652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130142464 + 126270169 = 11408^2 + 11237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256412633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256412633.

It is not an unprimeable number, because it can be changed into a prime (256412623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319316 + ... + 320117.

It is an arithmetic number, because the mean of its divisors is an integer number (64263117).

Almost surely, 2^256412633 is an apocalyptic number.

It is an amenable number.

256412633 is a deficient number, since it is larger than the sum of its proper divisors (639835).

256412633 is an equidigital number, since it uses as much as digits as its factorization.

256412633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639834.

The product of its digits is 25920, while the sum is 32.

The square root of 256412633 is about 16012.8895893277. The cubic root of 256412633 is about 635.3013908110.

The spelling of 256412633 in words is "two hundred fifty-six million, four hundred twelve thousand, six hundred thirty-three".