51818928 has 80 divisors (see below), whose sum is σ = 161061120. Its totient is φ = 14024448.

The previous prime is 51818903. The next prime is 51818953. The reversal of 51818928 is 82981815.

51818928 = 1257² + 1258² + ... + 1288².

It is an interprime number because it is at equal distance from previous prime (51818903) and next prime (51818953).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 51818928.

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, 2326 + ... + 10442.

It is an arithmetic number, because the mean of its divisors is an integer number (2013264).

Almost surely, 2^51818928 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 51818928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80530560).

51818928 is an abundant number, since it is smaller than the sum of its proper divisors (109242192).

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

51818928 is a wasteful number, since it uses less digits than its factorization.

51818928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154 (or 8148 counting only the distinct ones).

The product of its digits is 46080, while the sum is 42.

The square root of 51818928 is about 7198.5365179320. The cubic root of 51818928 is about 372.8173725687.

The spelling of 51818928 in words is "fifty-one million, eight hundred eighteen thousand, nine hundred twenty-eight".