79720049 has 2 divisors, whose sum is σ = 79720050. Its totient is φ = 79720048.

The previous prime is 79720027. The next prime is 79720073. The reversal of 79720049 is 94002797.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 19936225 = 7732^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 79720049 - 2²⁰ = 78671473 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79719994 and 79720021.

It is not a weakly prime, because it can be changed into another prime (79720009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39860024 + 39860025.

It is an arithmetic number, because the mean of its divisors is an integer number (39860025).

Almost surely, 2^79720049 is an apocalyptic number.

It is an amenable number.

79720049 is a deficient number, since it is larger than the sum of its proper divisors (1).

79720049 is an equidigital number, since it uses as much as digits as its factorization.

79720049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 79720049 is about 8928.6084582089. The cubic root of 79720049 is about 430.3837371293.

The spelling of 79720049 in words is "seventy-nine million, seven hundred twenty thousand, forty-nine".