80728699 has 8 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 74545536.

The previous prime is 80728649. The next prime is 80728717. The reversal of 80728699 is 99682708.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80728699 - 2¹⁵ = 80695931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80728649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43899 + ... + 45700.

It is an arithmetic number, because the mean of its divisors is an integer number (10886400).

Almost surely, 2^80728699 is an apocalyptic number.

80728699 is a deficient number, since it is larger than the sum of its proper divisors (6362501).

80728699 is a wasteful number, since it uses less digits than its factorization.

80728699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89669.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 80728699 is about 8984.9150802887. The cubic root of 80728699 is about 432.1912644009.

The spelling of 80728699 in words is "eighty million, seven hundred twenty-eight thousand, six hundred ninety-nine".