51018368 has 16 divisors (see below), whose sum is σ = 101638410. Its totient is φ = 25509120.

The previous prime is 51018367. The next prime is 51018371. The reversal of 51018368 is 86381015.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 22202944 = 5368^2 + 4712^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (51018367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199163 + ... + 199418.

Almost surely, 2^51018368 is an apocalyptic number.

It is an amenable number.

51018368 is a deficient number, since it is larger than the sum of its proper divisors (50620042).

51018368 is an equidigital number, since it uses as much as digits as its factorization.

51018368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398595 (or 398583 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 51018368 is about 7142.7143300009. The cubic root of 51018368 is about 370.8874921306.

The spelling of 51018368 in words is "fifty-one million, eighteen thousand, three hundred sixty-eight".