256527721 has 8 divisors (see below), whose sum is σ = 270195200. Its totient is φ = 242876880.

The previous prime is 256527703. The next prime is 256527743. The reversal of 256527721 is 127725652.

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

It is a cyclic number.

It is not a de Polignac number, because 256527721 - 2⁹ = 256527209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256527701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39160 + ... + 45238.

It is an arithmetic number, because the mean of its divisors is an integer number (33774400).

Almost surely, 2^256527721 is an apocalyptic number.

It is an amenable number.

256527721 is a deficient number, since it is larger than the sum of its proper divisors (13667479).

256527721 is a wasteful number, since it uses less digits than its factorization.

256527721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319.

The product of its digits is 58800, while the sum is 37.

The square root of 256527721 is about 16016.4827911748. The cubic root of 256527721 is about 635.3964259493.

The spelling of 256527721 in words is "two hundred fifty-six million, five hundred twenty-seven thousand, seven hundred twenty-one".