51988680 has 48 divisors (see below), whose sum is σ = 168964380. Its totient is φ = 13863552.

The previous prime is 51988679. The next prime is 51988681. The reversal of 51988680 is 8688915.

It is an interprime number because it is at equal distance from previous prime (51988679) and next prime (51988681).

It can be written as a sum of positive squares in 2 ways, for example, as 45239076 + 6749604 = 6726^2 + 2598^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (51988681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71847 + ... + 72566.

Almost surely, 2^51988680 is an apocalyptic number.

It is an amenable number.

51988680 is an abundant number, since it is smaller than the sum of its proper divisors (116975700).

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

51988680 is a wasteful number, since it uses less digits than its factorization.

51988680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144430 (or 144423 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51988680 is about 7210.3176074290. The cubic root of 51988680 is about 373.2240290839.

The spelling of 51988680 in words is "fifty-one million, nine hundred eighty-eight thousand, six hundred eighty".