53639220 has 96 divisors (see below), whose sum is σ = 160247808. Its totient is φ = 13374592.

The previous prime is 53639177. The next prime is 53639237. The reversal of 53639220 is 2293635.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64447 + ... + 65273.

It is an arithmetic number, because the mean of its divisors is an integer number (1669248).

Almost surely, 2^53639220 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 53639220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80123904).

53639220 is an abundant number, since it is smaller than the sum of its proper divisors (106608588).

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

53639220 is a wasteful number, since it uses less digits than its factorization.

53639220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 53639220 is about 7323.8801191718. The cubic root of 53639220 is about 377.1326660797.

The spelling of 53639220 in words is "fifty-three million, six hundred thirty-nine thousand, two hundred twenty".