53665884 has 72 divisors (see below), whose sum is σ = 140710752. Its totient is φ = 17233920.

The previous prime is 53665883. The next prime is 53665901. The reversal of 53665884 is 48856635.

53665884 is a `hidden beast` number, since 5 + 3 + 66 + 588 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53665883) 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, 151852 + ... + 152204.

It is an arithmetic number, because the mean of its divisors is an integer number (1954316).

Almost surely, 2^53665884 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 53665884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70355376).

53665884 is an abundant number, since it is smaller than the sum of its proper divisors (87044868).

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

53665884 is a wasteful number, since it uses less digits than its factorization.

53665884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 502 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 53665884 is about 7325.7002395675. The cubic root of 53665884 is about 377.1951464788.

Subtracting from 53665884 its reverse (48856635), we obtain a square (4809249 = 2193²).

The spelling of 53665884 in words is "fifty-three million, six hundred sixty-five thousand, eight hundred eighty-four".