50991720 has 64 divisors (see below), whose sum is σ = 164747520. Its totient is φ = 12551424.

The previous prime is 50991719. The next prime is 50991727. The reversal of 50991720 is 2719905.

It is not an unprimeable number, because it can be changed into a prime (50991727) 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, 14784 + ... + 17903.

It is an arithmetic number, because the mean of its divisors is an integer number (2574180).

Almost surely, 2^50991720 is an apocalyptic number.

It is an amenable number.

50991720 is an abundant number, since it is smaller than the sum of its proper divisors (113755800).

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

50991720 is a wasteful number, since it uses less digits than its factorization.

50991720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32714 (or 32710 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 50991720 is about 7140.8486890565. The cubic root of 50991720 is about 370.8229066911.

It can be divided in two parts, 509 and 91720, that added together give a palindrome (92229).

The spelling of 50991720 in words is "fifty million, nine hundred ninety-one thousand, seven hundred twenty".