51686704 has 20 divisors (see below), whose sum is σ = 104497776. Its totient is φ = 24719552.

The previous prime is 51686683. The next prime is 51686711. The reversal of 51686704 is 40768615.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 69859 + ... + 70594.

Almost surely, 2^51686704 is an apocalyptic number.

It is an amenable number.

51686704 is an abundant number, since it is smaller than the sum of its proper divisors (52811072).

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

51686704 is a wasteful number, since it uses less digits than its factorization.

51686704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140484 (or 140478 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 51686704 is about 7189.3465627969. The cubic root of 51686704 is about 372.5000021020.

The spelling of 51686704 in words is "fifty-one million, six hundred eighty-six thousand, seven hundred four".