51686887 has 8 divisors (see below), whose sum is σ = 60327936. Its totient is φ = 43360152.

The previous prime is 51686879. The next prime is 51686893. The reversal of 51686887 is 78868615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51686887 - 2³ = 51686879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51686887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78223 + ... + 78880.

It is an arithmetic number, because the mean of its divisors is an integer number (7540992).

Almost surely, 2^51686887 is an apocalyptic number.

51686887 is a deficient number, since it is larger than the sum of its proper divisors (8641049).

51686887 is a wasteful number, since it uses less digits than its factorization.

51686887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157157.

The product of its digits is 645120, while the sum is 49.

The square root of 51686887 is about 7189.3592899507. The cubic root of 51686887 is about 372.5004417213.

The spelling of 51686887 in words is "fifty-one million, six hundred eighty-six thousand, eight hundred eighty-seven".