79798457 has 2 divisors, whose sum is σ = 79798458. Its totient is φ = 79798456.

The previous prime is 79798451. The next prime is 79798469. The reversal of 79798457 is 75489797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40309801 + 39488656 = 6349^2 + 6284^2 .

It is an emirp because it is prime and its reverse (75489797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79798457 - 2⁶ = 79798393 is a prime.

It is not a weakly prime, because it can be changed into another prime (79798451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39899228 + 39899229.

It is an arithmetic number, because the mean of its divisors is an integer number (39899229).

Almost surely, 2^79798457 is an apocalyptic number.

It is an amenable number.

79798457 is a deficient number, since it is larger than the sum of its proper divisors (1).

79798457 is an equidigital number, since it uses as much as digits as its factorization.

79798457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The square root of 79798457 is about 8932.9982088882. The cubic root of 79798457 is about 430.5247910262.

The spelling of 79798457 in words is "seventy-nine million, seven hundred ninety-eight thousand, four hundred fifty-seven".