53353728 has 180 divisors, whose sum is σ = 166201728. Its totient is φ = 17003520.

The previous prime is 53353709. The next prime is 53353733. The reversal of 53353728 is 82735335.

53353728 is a `hidden beast` number, since 533 + 53 + 72 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 53353692 and 53353701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 642775 + ... + 642857.

Almost surely, 2^53353728 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 53353728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83100864).

53353728 is an abundant number, since it is smaller than the sum of its proper divisors (112848000).

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

53353728 is an equidigital number, since it uses as much as digits as its factorization.

53353728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 119 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 53353728 is about 7304.3636273121. The cubic root of 53353728 is about 376.4623857281.

The spelling of 53353728 in words is "fifty-three million, three hundred fifty-three thousand, seven hundred twenty-eight".