80318721 has 16 divisors (see below), whose sum is σ = 123516800. Its totient is φ = 45474048.

The previous prime is 80318717. The next prime is 80318731. The reversal of 80318721 is 12781308.

It is a happy number.

It is not a de Polignac number, because 80318721 - 2² = 80318717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80318701) 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, 15256 + ... + 19833.

It is an arithmetic number, because the mean of its divisors is an integer number (7719800).

Almost surely, 2^80318721 is an apocalyptic number.

It is an amenable number.

80318721 is a deficient number, since it is larger than the sum of its proper divisors (43198079).

80318721 is a wasteful number, since it uses less digits than its factorization.

80318721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35208.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 80318721 is about 8962.0712449746. The cubic root of 80318721 is about 431.4583994228.

It can be divided in two parts, 80 and 318721, that added together give a triangular number (318801 = T₇₉₈).

The spelling of 80318721 in words is "eighty million, three hundred eighteen thousand, seven hundred twenty-one".