80776679 has 4 divisors (see below), whose sum is σ = 81749976. Its totient is φ = 79803384.

The previous prime is 80776643. The next prime is 80776721. The reversal of 80776679 is 97667708.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80776679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80776609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486524 + ... + 486689.

It is an arithmetic number, because the mean of its divisors is an integer number (20437494).

Almost surely, 2^80776679 is an apocalyptic number.

80776679 is a deficient number, since it is larger than the sum of its proper divisors (973297).

80776679 is an equidigital number, since it uses as much as digits as its factorization.

80776679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973296.

The product of its (nonzero) digits is 889056, while the sum is 50.

The square root of 80776679 is about 8987.5847144825. The cubic root of 80776679 is about 432.2768697693.

The spelling of 80776679 in words is "eighty million, seven hundred seventy-six thousand, six hundred seventy-nine".