51305686 has 16 divisors (see below), whose sum is σ = 80485344. Its totient is φ = 24482304.

The previous prime is 51305671. The next prime is 51305687. The reversal of 51305686 is 68650315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305687) 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, 25576 + ... + 27508.

It is an arithmetic number, because the mean of its divisors is an integer number (5030334).

Almost surely, 2^51305686 is an apocalyptic number.

51305686 is a deficient number, since it is larger than the sum of its proper divisors (29179658).

51305686 is a wasteful number, since it uses less digits than its factorization.

51305686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 51305686 is about 7162.7987546768. The cubic root of 51305686 is about 371.5824263846.

It can be divided in two parts, 5130 and 5686, that added together give a square (10816 = 104²).

The spelling of 51305686 in words is "fifty-one million, three hundred five thousand, six hundred eighty-six".