50718721 has 8 divisors (see below), whose sum is σ = 52387560. Its totient is φ = 49076352.

The previous prime is 50718719. The next prime is 50718751. The reversal of 50718721 is 12781705.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10890000 + 39828721 = 3300^2 + 6311^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 50718721 - 2¹ = 50718719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50718751) 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, 2686 + ... + 10423.

It is an arithmetic number, because the mean of its divisors is an integer number (6548445).

Almost surely, 2^50718721 is an apocalyptic number.

It is an amenable number.

50718721 is a deficient number, since it is larger than the sum of its proper divisors (1668839).

50718721 is a wasteful number, since it uses less digits than its factorization.

50718721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13235.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 50718721 is about 7121.7077305938. The cubic root of 50718721 is about 370.1599527555.

The spelling of 50718721 in words is "fifty million, seven hundred eighteen thousand, seven hundred twenty-one".