256724701 has 4 divisors (see below), whose sum is σ = 271826172. Its totient is φ = 241623232.

The previous prime is 256724693. The next prime is 256724707. The reversal of 256724701 is 107427652.

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 143280900 + 113443801 = 11970^2 + 10651^2 .

It is a cyclic number.

It is not a de Polignac number, because 256724701 - 2³ = 256724693 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 (256724707) 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, 7550710 + ... + 7550743.

It is an arithmetic number, because the mean of its divisors is an integer number (67956543).

Almost surely, 2^256724701 is an apocalyptic number.

It is an amenable number.

256724701 is a deficient number, since it is larger than the sum of its proper divisors (15101471).

256724701 is a wasteful number, since it uses less digits than its factorization.

256724701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15101470.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 256724701 is about 16022.6309013220. The cubic root of 256724701 is about 635.5590183396.

The spelling of 256724701 in words is "two hundred fifty-six million, seven hundred twenty-four thousand, seven hundred one".