80879779 has 2 divisors, whose sum is σ = 80879780. Its totient is φ = 80879778.

The previous prime is 80879767. The next prime is 80879783. The reversal of 80879779 is 97797808.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80879779 - 2²⁵ = 47325347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80879719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40439889 + 40439890.

It is an arithmetic number, because the mean of its divisors is an integer number (40439890).

Almost surely, 2^80879779 is an apocalyptic number.

80879779 is a deficient number, since it is larger than the sum of its proper divisors (1).

80879779 is an equidigital number, since it uses as much as digits as its factorization.

80879779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 80879779 is about 8993.3185754759. The cubic root of 80879779 is about 432.4607049958.

The spelling of 80879779 in words is "eighty million, eight hundred seventy-nine thousand, seven hundred seventy-nine".