51815888 has 20 divisors (see below), whose sum is σ = 105677760. Its totient is φ = 24544224.

The previous prime is 51815887. The next prime is 51815891. The reversal of 51815888 is 88851815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51815887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84920 + ... + 85527.

It is an arithmetic number, because the mean of its divisors is an integer number (5283888).

Almost surely, 2^51815888 is an apocalyptic number.

It is an amenable number.

51815888 is an abundant number, since it is smaller than the sum of its proper divisors (53861872).

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

51815888 is a wasteful number, since it uses less digits than its factorization.

51815888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170474 (or 170468 counting only the distinct ones).

The product of its digits is 102400, while the sum is 44.

The square root of 51815888 is about 7198.3253608044. The cubic root of 51815888 is about 372.8100818803.

The spelling of 51815888 in words is "fifty-one million, eight hundred fifteen thousand, eight hundred eighty-eight".