51518712 has 128 divisors (see below), whose sum is σ = 156672000. Its totient is φ = 13799808.

The previous prime is 51518711. The next prime is 51518717. The reversal of 51518712 is 21781515.

It is a super-2 number, since 2×51518712² = 5308355372277888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51518712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51518711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258789 + ... + 258987.

It is an arithmetic number, because the mean of its divisors is an integer number (1224000).

Almost surely, 2^51518712 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 51518712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78336000).

51518712 is an abundant number, since it is smaller than the sum of its proper divisors (105153288).

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

51518712 is a wasteful number, since it uses less digits than its factorization.

51518712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 301 counting only the distinct ones).

The product of its digits is 2800, while the sum is 30.

The square root of 51518712 is about 7177.6536556176. The cubic root of 51518712 is about 372.0959978863.

The spelling of 51518712 in words is "fifty-one million, five hundred eighteen thousand, seven hundred twelve".