51978888 has 128 divisors (see below), whose sum is σ = 157852800. Its totient is φ = 15752448.

The previous prime is 51978869. The next prime is 51978923. The reversal of 51978888 is 88887915.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 300370 + ... + 300542.

It is an arithmetic number, because the mean of its divisors is an integer number (1233225).

Almost surely, 2^51978888 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 51978888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78926400).

51978888 is an abundant number, since it is smaller than the sum of its proper divisors (105873912).

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

51978888 is a wasteful number, since it uses less digits than its factorization.

51978888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 298 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The square root of 51978888 is about 7209.6385484988. The cubic root of 51978888 is about 373.2005955264.

The spelling of 51978888 in words is "fifty-one million, nine hundred seventy-eight thousand, eight hundred eighty-eight".