255572721 has 24 divisors (see below), whose sum is σ = 379098720. Its totient is φ = 165816000.

The previous prime is 255572689. The next prime is 255572749. The reversal of 255572721 is 127275552.

It is not a de Polignac number, because 255572721 - 2⁵ = 255572689 is a prime.

It is a super-3 number, since 3×255572721³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (255572761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242646 + ... + 243696.

It is an arithmetic number, because the mean of its divisors is an integer number (15795780).

Almost surely, 2^255572721 is an apocalyptic number.

It is an amenable number.

255572721 is a deficient number, since it is larger than the sum of its proper divisors (123525999).

255572721 is a wasteful number, since it uses less digits than its factorization.

255572721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757 (or 1754 counting only the distinct ones).

The product of its digits is 49000, while the sum is 36.

The square root of 255572721 is about 15986.6419550824. The cubic root of 255572721 is about 634.6069620175.

The spelling of 255572721 in words is "two hundred fifty-five million, five hundred seventy-two thousand, seven hundred twenty-one".