51539328 has 96 divisors (see below), whose sum is σ = 153895560. Its totient is φ = 17169408.

The previous prime is 51539311. The next prime is 51539377. The reversal of 51539328 is 82393515.

It is a tau number, because it is divible by the number of its divisors (96).

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 = 51539292 and 51539301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30276 + ... + 31932.

Almost surely, 2^51539328 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 51539328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76947780).

51539328 is an abundant number, since it is smaller than the sum of its proper divisors (102356232).

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

51539328 is an equidigital number, since it uses as much as digits as its factorization.

51539328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1662 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 51539328 is about 7179.0896358800. The cubic root of 51539328 is about 372.1456245675.

The spelling of 51539328 in words is "fifty-one million, five hundred thirty-nine thousand, three hundred twenty-eight".