51918264 has 24 divisors (see below), whose sum is σ = 140612160. Its totient is φ = 17306064.

The previous prime is 51918263. The next prime is 51918277. The reversal of 51918264 is 46281915.

51918264 is a `hidden beast` number, since 519 + 1 + 82 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×51918264² = 5391012273547392, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51918263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360472 + ... + 360615.

It is an arithmetic number, because the mean of its divisors is an integer number (5858840).

Almost surely, 2^51918264 is an apocalyptic number.

It is an amenable number.

51918264 is an abundant number, since it is smaller than the sum of its proper divisors (88693896).

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

51918264 is a wasteful number, since it uses less digits than its factorization.

51918264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721099 (or 721092 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 51918264 is about 7205.4329502119. The cubic root of 51918264 is about 373.0554486829.

The spelling of 51918264 in words is "fifty-one million, nine hundred eighteen thousand, two hundred sixty-four".