53691568 has 80 divisors (see below), whose sum is σ = 130705920. Its totient is φ = 20832768.

The previous prime is 53691553. The next prime is 53691623. The reversal of 53691568 is 86519635.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48396 + ... + 49492.

It is an arithmetic number, because the mean of its divisors is an integer number (1633824).

Almost surely, 2^53691568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53691568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65352960).

53691568 is an abundant number, since it is smaller than the sum of its proper divisors (77014352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53691568 is a wasteful number, since it uses less digits than its factorization.

53691568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1148 counting only the distinct ones).

The product of its digits is 194400, while the sum is 43.

The square root of 53691568 is about 7327.4530363558. The cubic root of 53691568 is about 377.2553109279.

The spelling of 53691568 in words is "fifty-three million, six hundred ninety-one thousand, five hundred sixty-eight".