51387687 has 24 divisors (see below), whose sum is σ = 81454464. Its totient is φ = 31022784.

The previous prime is 51387671. The next prime is 51387701. The reversal of 51387687 is 78678315.

It is not a de Polignac number, because 51387687 - 2⁴ = 51387671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51387587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2058 + ... + 10344.

It is an arithmetic number, because the mean of its divisors is an integer number (3393936).

Almost surely, 2^51387687 is an apocalyptic number.

51387687 is a deficient number, since it is larger than the sum of its proper divisors (30066777).

51387687 is a wasteful number, since it uses less digits than its factorization.

51387687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8359 (or 8356 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 51387687 is about 7168.5205586648. The cubic root of 51387687 is about 371.7802856216.

The spelling of 51387687 in words is "fifty-one million, three hundred eighty-seven thousand, six hundred eighty-seven".