51916880 has 20 divisors (see below), whose sum is σ = 120706932. Its totient is φ = 20766720.

The previous prime is 51916877. The next prime is 51916889. The reversal of 51916880 is 8861915.

It can be written as a sum of positive squares in 2 ways, for example, as 26956864 + 24960016 = 5192^2 + 4996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×51916880³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51916889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324401 + ... + 324560.

Almost surely, 2^51916880 is an apocalyptic number.

It is an amenable number.

51916880 is an abundant number, since it is smaller than the sum of its proper divisors (68790052).

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

51916880 is a wasteful number, since it uses less digits than its factorization.

51916880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648974 (or 648968 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 51916880 is about 7205.3369109293. The cubic root of 51916880 is about 373.0521337715.

The spelling of 51916880 in words is "fifty-one million, nine hundred sixteen thousand, eight hundred eighty".