80720913 has 32 divisors (see below), whose sum is σ = 140265216. Its totient is φ = 40071168.

The previous prime is 80720881. The next prime is 80720921. The reversal of 80720913 is 31902708.

It is a happy number.

It is not a de Polignac number, because 80720913 - 2⁵ = 80720881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80720963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4056 + ... + 13337.

It is an arithmetic number, because the mean of its divisors is an integer number (4383288).

Almost surely, 2^80720913 is an apocalyptic number.

It is an amenable number.

80720913 is a deficient number, since it is larger than the sum of its proper divisors (59544303).

80720913 is a wasteful number, since it uses less digits than its factorization.

80720913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17433.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 80720913 is about 8984.4817880610. The cubic root of 80720913 is about 432.1773695101.

The spelling of 80720913 in words is "eighty million, seven hundred twenty thousand, nine hundred thirteen".