256704653 has 4 divisors (see below), whose sum is σ = 260912988. Its totient is φ = 252496320.

The previous prime is 256704629. The next prime is 256704667. The reversal of 256704653 is 356407652.

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 8421604 + 248283049 = 2902^2 + 15757^2 .

It is a cyclic number.

It is not a de Polignac number, because 256704653 - 2¹² = 256700557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256704673) 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, 2104076 + ... + 2104197.

It is an arithmetic number, because the mean of its divisors is an integer number (65228247).

Almost surely, 2^256704653 is an apocalyptic number.

It is an amenable number.

256704653 is a deficient number, since it is larger than the sum of its proper divisors (4208335).

256704653 is an equidigital number, since it uses as much as digits as its factorization.

256704653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208334.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 256704653 is about 16022.0052739974. The cubic root of 256704653 is about 635.5424740039.

The spelling of 256704653 in words is "two hundred fifty-six million, seven hundred four thousand, six hundred fifty-three".