51868518 has 64 divisors (see below), whose sum is σ = 121497600. Its totient is φ = 14618880.

The previous prime is 51868457. The next prime is 51868529. The reversal of 51868518 is 81586815.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51868518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45378 + ... + 46506.

It is an arithmetic number, because the mean of its divisors is an integer number (1898400).

Almost surely, 2^51868518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51868518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60748800).

51868518 is an abundant number, since it is smaller than the sum of its proper divisors (69629082).

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

51868518 is a wasteful number, since it uses less digits than its factorization.

51868518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197.

The product of its digits is 76800, while the sum is 42.

The square root of 51868518 is about 7201.9801443770. The cubic root of 51868518 is about 372.9362616810.

The spelling of 51868518 in words is "fifty-one million, eight hundred sixty-eight thousand, five hundred eighteen".