53221764 has 48 divisors (see below), whose sum is σ = 132064128. Its totient is φ = 16624128.

The previous prime is 53221711. The next prime is 53221771. The reversal of 53221764 is 46712235.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64257 + ... + 65079.

It is an arithmetic number, because the mean of its divisors is an integer number (2751336).

Almost surely, 2^53221764 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 53221764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66032064).

53221764 is an abundant number, since it is smaller than the sum of its proper divisors (78842364).

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

53221764 is a wasteful number, since it uses less digits than its factorization.

53221764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1162 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 53221764 is about 7295.3248042839. The cubic root of 53221764 is about 376.1517514061.

Adding to 53221764 its reverse (46712235), we get a palindrome (99933999).

The spelling of 53221764 in words is "fifty-three million, two hundred twenty-one thousand, seven hundred sixty-four".