53329728 has 56 divisors (see below), whose sum is σ = 144934432. Its totient is φ = 17293824.

The previous prime is 53329721. The next prime is 53329747. The reversal of 53329728 is 82792335.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53329721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351 + ... + 10857.

Almost surely, 2^53329728 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 53329728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72467216).

53329728 is an abundant number, since it is smaller than the sum of its proper divisors (91604704).

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

53329728 is a wasteful number, since it uses less digits than its factorization.

53329728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559 (or 7549 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 53329728 is about 7302.7205889312. The cubic root of 53329728 is about 376.4059294899.

The spelling of 53329728 in words is "fifty-three million, three hundred twenty-nine thousand, seven hundred twenty-eight".