51187688 has 8 divisors (see below), whose sum is σ = 95976930. Its totient is φ = 25593840.

The previous prime is 51187681. The next prime is 51187699. The reversal of 51187688 is 88678115.

51187688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 14730244 = 6038^2 + 3838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51187681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199223 + ... + 3199238.

Almost surely, 2^51187688 is an apocalyptic number.

It is an amenable number.

51187688 is a deficient number, since it is larger than the sum of its proper divisors (44789242).

51187688 is a wasteful number, since it uses less digits than its factorization.

51187688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6398467 (or 6398463 counting only the distinct ones).

The product of its digits is 107520, while the sum is 44.

The square root of 51187688 is about 7154.5571491183. The cubic root of 51187688 is about 371.2973401145.

The spelling of 51187688 in words is "fifty-one million, one hundred eighty-seven thousand, six hundred eighty-eight".