80779679 has 4 divisors (see below), whose sum is σ = 80990976. Its totient is φ = 80568384.

The previous prime is 80779669. The next prime is 80779687. The reversal of 80779679 is 97697708.

It is a happy number.

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 80779679 - 2⁴ = 80779663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80779679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80779609) 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, 105074 + ... + 105839.

It is an arithmetic number, because the mean of its divisors is an integer number (20247744).

Almost surely, 2^80779679 is an apocalyptic number.

80779679 is a deficient number, since it is larger than the sum of its proper divisors (211297).

80779679 is a wasteful number, since it uses less digits than its factorization.

80779679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211296.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 80779679 is about 8987.7516098299. The cubic root of 80779679 is about 432.2822212089.

The spelling of 80779679 in words is "eighty million, seven hundred seventy-nine thousand, six hundred seventy-nine".