80721404 has 12 divisors (see below), whose sum is σ = 141325800. Its totient is φ = 40342608.

The previous prime is 80721397. The next prime is 80721439. The reversal of 80721404 is 40412708.

It is a congruent number.

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, 13427 + ... + 18485.

It is an arithmetic number, because the mean of its divisors is an integer number (11777150).

Almost surely, 2^80721404 is an apocalyptic number.

It is an amenable number.

80721404 is a deficient number, since it is larger than the sum of its proper divisors (60604396).

80721404 is a wasteful number, since it uses less digits than its factorization.

80721404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9052 (or 9050 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 80721404 is about 8984.5091129121. The cubic root of 80721404 is about 432.1782457747.

The spelling of 80721404 in words is "eighty million, seven hundred twenty-one thousand, four hundred four".