679881757 has 2 divisors, whose sum is σ = 679881758. Its totient is φ = 679881756.

The previous prime is 679881691. The next prime is 679881781. The reversal of 679881757 is 757188976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583174201 + 96707556 = 24149^2 + 9834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679881757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679881157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339940878 + 339940879.

It is an arithmetic number, because the mean of its divisors is an integer number (339940879).

Almost surely, 2^679881757 is an apocalyptic number.

It is an amenable number.

679881757 is a deficient number, since it is larger than the sum of its proper divisors (1).

679881757 is an equidigital number, since it uses as much as digits as its factorization.

679881757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 58.

The square root of 679881757 is about 26074.5423162133. The cubic root of 679881757 is about 879.3149614446.

The spelling of 679881757 in words is "six hundred seventy-nine million, eight hundred eighty-one thousand, seven hundred fifty-seven".