51716720 has 80 divisors (see below), whose sum is σ = 138928608. Its totient is φ = 17694720.

The previous prime is 51716699. The next prime is 51716723. The reversal of 51716720 is 2761715.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51716723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13232 + ... + 16688.

Almost surely, 2^51716720 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 51716720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69464304).

51716720 is an abundant number, since it is smaller than the sum of its proper divisors (87211888).

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

51716720 is a wasteful number, since it uses less digits than its factorization.

51716720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3492 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 51716720 is about 7191.4337930624. The cubic root of 51716720 is about 372.5720954099.

The spelling of 51716720 in words is "fifty-one million, seven hundred sixteen thousand, seven hundred twenty".