80721804 has 24 divisors (see below), whose sum is σ = 198264640. Its totient is φ = 25491024.

The previous prime is 80721791. The next prime is 80721811. The reversal of 80721804 is 40812708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176794 + ... + 177249.

Almost surely, 2^80721804 is an apocalyptic number.

It is an amenable number.

80721804 is an abundant number, since it is smaller than the sum of its proper divisors (117542836).

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

80721804 is a wasteful number, since it uses less digits than its factorization.

80721804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354069 (or 354067 counting only the distinct ones).

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

The square root of 80721804 is about 8984.5313734218. The cubic root of 80721804 is about 432.1789596334.

The spelling of 80721804 in words is "eighty million, seven hundred twenty-one thousand, eight hundred four".