79978757 has 2 divisors, whose sum is σ = 79978758. Its totient is φ = 79978756.

The previous prime is 79978739. The next prime is 79978763. The reversal of 79978757 is 75787997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 31967716 = 6929^2 + 5654^2 .

It is a cyclic number.

It is not a de Polignac number, because 79978757 - 2²⁶ = 12869893 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79978696 and 79978705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79978957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39989378 + 39989379.

It is an arithmetic number, because the mean of its divisors is an integer number (39989379).

Almost surely, 2^79978757 is an apocalyptic number.

It is an amenable number.

79978757 is a deficient number, since it is larger than the sum of its proper divisors (1).

79978757 is an equidigital number, since it uses as much as digits as its factorization.

79978757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7779240, while the sum is 59.

The square root of 79978757 is about 8943.0843113548. The cubic root of 79978757 is about 430.8487957500.

The spelling of 79978757 in words is "seventy-nine million, nine hundred seventy-eight thousand, seven hundred fifty-seven".