53997657 has 24 divisors (see below), whose sum is σ = 84558816. Its totient is φ = 30558528.

The previous prime is 53997649. The next prime is 53997667. The reversal of 53997657 is 75679935.

It is not a de Polignac number, because 53997657 - 2³ = 53997649 is a prime.

It is a super-2 number, since 2×53997657² = 5831493922979298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53997607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14013 + ... + 17445.

It is an arithmetic number, because the mean of its divisors is an integer number (3523284).

Almost surely, 2^53997657 is an apocalyptic number.

It is an amenable number.

53997657 is a deficient number, since it is larger than the sum of its proper divisors (30561159).

53997657 is a wasteful number, since it uses less digits than its factorization.

53997657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557 (or 3550 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 51.

The square root of 53997657 is about 7348.3098056628. The cubic root of 53997657 is about 377.9708482320.

The spelling of 53997657 in words is "fifty-three million, nine hundred ninety-seven thousand, six hundred fifty-seven".