51392720 has 40 divisors (see below), whose sum is σ = 125780640. Its totient is φ = 19474560.

The previous prime is 51392707. The next prime is 51392723. The reversal of 51392720 is 2729315.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51392723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15386 + ... + 18425.

It is an arithmetic number, because the mean of its divisors is an integer number (3144516).

Almost surely, 2^51392720 is an apocalyptic number.

It is an amenable number.

51392720 is an abundant number, since it is smaller than the sum of its proper divisors (74387920).

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

51392720 is a wasteful number, since it uses less digits than its factorization.

51392720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33843 (or 33837 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 51392720 is about 7168.8715987943. The cubic root of 51392720 is about 371.7924228293.

The spelling of 51392720 in words is "fifty-one million, three hundred ninety-two thousand, seven hundred twenty".