51018768 has 80 divisors (see below), whose sum is σ = 155079360. Its totient is φ = 16003584.

The previous prime is 51018757. The next prime is 51018791. The reversal of 51018768 is 86781015.

51018768 is a `hidden beast` number, since 510 + 1 + 87 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871 + ... + 10817.

It is an arithmetic number, because the mean of its divisors is an integer number (1938492).

Almost surely, 2^51018768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51018768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77539680).

51018768 is an abundant number, since it is smaller than the sum of its proper divisors (104060592).

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

51018768 is a wasteful number, since it uses less digits than its factorization.

51018768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981 (or 6969 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 51018768 is about 7142.7423305058. The cubic root of 51018768 is about 370.8884614195. Note that the first 3 decimals are identical.

The spelling of 51018768 in words is "fifty-one million, eighteen thousand, seven hundred sixty-eight".