51480720 has 120 divisors (see below), whose sum is σ = 174560256. Its totient is φ = 13595904.

The previous prime is 51480719. The next prime is 51480731. The reversal of 51480720 is 2708415.

51480720 is a `hidden beast` number, since 514 + 80 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91159 + ... + 91721.

Almost surely, 2^51480720 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 51480720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87280128).

51480720 is an abundant number, since it is smaller than the sum of its proper divisors (123079536).

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

51480720 is a wasteful number, since it uses less digits than its factorization.

51480720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51480720 is about 7175.0066202060. The cubic root of 51480720 is about 372.0045091372.

The spelling of 51480720 in words is "fifty-one million, four hundred eighty thousand, seven hundred twenty".