57998721 has 16 divisors (see below), whose sum is σ = 86643648. Its totient is φ = 34200000.

The previous prime is 57998687. The next prime is 57998729. The reversal of 57998721 is 12789975.

It is not a de Polignac number, because 57998721 - 2¹³ = 57990529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57998729) 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, 22530 + ... + 24971.

It is an arithmetic number, because the mean of its divisors is an integer number (5415228).

Almost surely, 2^57998721 is an apocalyptic number.

It is an amenable number.

57998721 is a deficient number, since it is larger than the sum of its proper divisors (28644927).

57998721 is a wasteful number, since it uses less digits than its factorization.

57998721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47552.

The product of its digits is 317520, while the sum is 48.

The square root of 57998721 is about 7615.6891349372. The cubic root of 57998721 is about 387.0848187251.

The spelling of 57998721 in words is "fifty-seven million, nine hundred ninety-eight thousand, seven hundred twenty-one".