51388008 has 128 divisors (see below), whose sum is σ = 163814400. Its totient is φ = 13077504.

The previous prime is 51387961. The next prime is 51388019. The reversal of 51388008 is 80088315.

It is a self number, because there is not a number n which added to its sum of digits gives 51388008.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53791 + ... + 54737.

It is an arithmetic number, because the mean of its divisors is an integer number (1279800).

Almost surely, 2^51388008 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 51388008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81907200).

51388008 is an abundant number, since it is smaller than the sum of its proper divisors (112426392).

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

51388008 is a wasteful number, since it uses less digits than its factorization.

51388008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 51388008 is about 7168.5429481869. The cubic root of 51388008 is about 371.7810597449.

The spelling of 51388008 in words is "fifty-one million, three hundred eighty-eight thousand, eight".