80720005 has 16 divisors (see below), whose sum is σ = 98607600. Its totient is φ = 63424512.

The previous prime is 80719997. The next prime is 80720011. The reversal of 80720005 is 50002708.

It can be written as a sum of positive squares in 8 ways, for example, as 25826724 + 54893281 = 5082^2 + 7409^2 .

It is a cyclic number.

It is not a de Polignac number, because 80720005 - 2³ = 80719997 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 71707 + ... + 72823.

It is an arithmetic number, because the mean of its divisors is an integer number (6162975).

Almost surely, 2^80720005 is an apocalyptic number.

It is an amenable number.

80720005 is a deficient number, since it is larger than the sum of its proper divisors (17887595).

80720005 is a wasteful number, since it uses less digits than its factorization.

80720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 80720005 is about 8984.4312563456. The cubic root of 80720005 is about 432.1757490356.

The spelling of 80720005 in words is "eighty million, seven hundred twenty thousand, five".