51381568 has 28 divisors (see below), whose sum is σ = 116527072. Its totient is φ = 22020480.

The previous prime is 51381557. The next prime is 51381587. The reversal of 51381568 is 86518315.

It is a tau number, because it is divible by the number of its divisors (28).

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, 56898 + ... + 57793.

Almost surely, 2^51381568 is an apocalyptic number.

It is an amenable number.

51381568 is an abundant number, since it is smaller than the sum of its proper divisors (65145504).

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

51381568 is a wasteful number, since it uses less digits than its factorization.

51381568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114710 (or 114700 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 51381568 is about 7168.0937493869. The cubic root of 51381568 is about 371.7655284297.

The spelling of 51381568 in words is "fifty-one million, three hundred eighty-one thousand, five hundred sixty-eight".