51086720 has 32 divisors (see below), whose sum is σ = 122130720. Its totient is φ = 20434432.

The previous prime is 51086713. The next prime is 51086723. The reversal of 51086720 is 2768015.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51086723) 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, 39272 + ... + 40551.

It is an arithmetic number, because the mean of its divisors is an integer number (3816585).

Almost surely, 2^51086720 is an apocalyptic number.

It is an amenable number.

51086720 is an abundant number, since it is smaller than the sum of its proper divisors (71044000).

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

51086720 is an equidigital number, since it uses as much as digits as its factorization.

51086720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79842 (or 79830 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 51086720 is about 7147.4974641479. The cubic root of 51086720 is about 371.0530507321.

The spelling of 51086720 in words is "fifty-one million, eighty-six thousand, seven hundred twenty".