51190686 has 48 divisors (see below), whose sum is σ = 117969696. Its totient is φ = 16006848.

The previous prime is 51190679. The next prime is 51190729. The reversal of 51190686 is 68609115.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51190686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20776 + ... + 23108.

It is an arithmetic number, because the mean of its divisors is an integer number (2457702).

Almost surely, 2^51190686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51190686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58984848).

51190686 is an abundant number, since it is smaller than the sum of its proper divisors (66779010).

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

51190686 is a wasteful number, since it uses less digits than its factorization.

51190686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417 (or 2414 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 51190686 is about 7154.7666628619. The cubic root of 51190686 is about 371.3045887827.

The spelling of 51190686 in words is "fifty-one million, one hundred ninety thousand, six hundred eighty-six".