57764721 has 16 divisors (see below), whose sum is σ = 89139200. Its totient is φ = 32589648.

The previous prime is 57764719. The next prime is 57764741. The reversal of 57764721 is 12746775.

It is not a de Polignac number, because 57764721 - 2¹ = 57764719 is a prime.

It is a super-3 number, since 3×57764721³ (a number of 24 digits) contains 333 as substring.

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 57764721.

It is not an unprimeable number, because it can be changed into a prime (57764701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15751 + ... + 19068.

It is an arithmetic number, because the mean of its divisors is an integer number (5571200).

Almost surely, 2^57764721 is an apocalyptic number.

It is an amenable number.

57764721 is a deficient number, since it is larger than the sum of its proper divisors (31374479).

57764721 is a wasteful number, since it uses less digits than its factorization.

57764721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34908.

The product of its digits is 82320, while the sum is 39.

The square root of 57764721 is about 7600.3105857590. The cubic root of 57764721 is about 386.5635432322.

It can be divided in two parts, 57764 and 721, that added together give a palindrome (58485).

The spelling of 57764721 in words is "fifty-seven million, seven hundred sixty-four thousand, seven hundred twenty-one".