80728811 has 4 divisors (see below), whose sum is σ = 81111624. Its totient is φ = 80346000.

The previous prime is 80728793. The next prime is 80728819. The reversal of 80728811 is 11882708.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80728811 - 2¹⁴ = 80712427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80728819) 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 3 ways as a sum of consecutive naturals, for example, 191090 + ... + 191511.

It is an arithmetic number, because the mean of its divisors is an integer number (20277906).

Almost surely, 2^80728811 is an apocalyptic number.

80728811 is a deficient number, since it is larger than the sum of its proper divisors (382813).

80728811 is a wasteful number, since it uses less digits than its factorization.

80728811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382812.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 80728811 is about 8984.9213129554. The cubic root of 80728811 is about 432.1914642695.

The spelling of 80728811 in words is "eighty million, seven hundred twenty-eight thousand, eight hundred eleven".