51815328 has 24 divisors (see below), whose sum is σ = 136015488. Its totient is φ = 17271744.

The previous prime is 51815317. The next prime is 51815329. The reversal of 51815328 is 82351815.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (51815329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269776 + ... + 269967.

It is an arithmetic number, because the mean of its divisors is an integer number (5667312).

Almost surely, 2^51815328 is an apocalyptic number.

It is an amenable number.

51815328 is an abundant number, since it is smaller than the sum of its proper divisors (84200160).

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

51815328 is a wasteful number, since it uses less digits than its factorization.

51815328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539756 (or 539748 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 51815328 is about 7198.2864627632. The cubic root of 51815328 is about 372.8087388276.

The spelling of 51815328 in words is "fifty-one million, eight hundred fifteen thousand, three hundred twenty-eight".