51387568 has 10 divisors (see below), whose sum is σ = 99563444. Its totient is φ = 25693776.

The previous prime is 51387563. The next prime is 51387587. The reversal of 51387568 is 86578315.

It is not an unprimeable number, because it can be changed into a prime (51387563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605846 + ... + 1605877.

Almost surely, 2^51387568 is an apocalyptic number.

It is an amenable number.

51387568 is a deficient number, since it is larger than the sum of its proper divisors (48175876).

51387568 is a wasteful number, since it uses less digits than its factorization.

51387568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211731 (or 3211725 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The square root of 51387568 is about 7168.5122584815. The cubic root of 51387568 is about 371.7799986405.

The spelling of 51387568 in words is "fifty-one million, three hundred eighty-seven thousand, five hundred sixty-eight".