80221728 has 24 divisors (see below), whose sum is σ = 210582288. Its totient is φ = 26740544.

The previous prime is 80221717. The next prime is 80221753. The reversal of 80221728 is 82712208.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 80221695 and 80221704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417726 + ... + 417917.

It is an arithmetic number, because the mean of its divisors is an integer number (8774262).

Almost surely, 2^80221728 is an apocalyptic number.

It is an amenable number.

80221728 is an abundant number, since it is smaller than the sum of its proper divisors (130360560).

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

80221728 is a wasteful number, since it uses less digits than its factorization.

80221728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835656 (or 835648 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 80221728 is about 8956.6583054173. The cubic root of 80221728 is about 431.2846528760.

The spelling of 80221728 in words is "eighty million, two hundred twenty-one thousand, seven hundred twenty-eight".