51388988 has 12 divisors (see below), whose sum is σ = 102778032. Its totient is φ = 22023840.

The previous prime is 51388973. The next prime is 51388993. The reversal of 51388988 is 88988315.

51388988 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917633 + ... + 917688.

It is an arithmetic number, because the mean of its divisors is an integer number (8564836).

Almost surely, 2^51388988 is an apocalyptic number.

It is an amenable number.

51388988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51388988 is a wasteful number, since it uses less digits than its factorization.

51388988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835332 (or 1835330 counting only the distinct ones).

The product of its digits is 552960, while the sum is 50.

The square root of 51388988 is about 7168.6113020584. The cubic root of 51388988 is about 371.7834230922.

The spelling of 51388988 in words is "fifty-one million, three hundred eighty-eight thousand, nine hundred eighty-eight".