679926157 has 4 divisors (see below), whose sum is σ = 683856540. Its totient is φ = 675995776.

The previous prime is 679926151. The next prime is 679926179. The reversal of 679926157 is 751629976.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 641659561 + 38266596 = 25331^2 + 6186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679926157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679926151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964932 + ... + 1965277.

It is an arithmetic number, because the mean of its divisors is an integer number (170964135).

Almost surely, 2^679926157 is an apocalyptic number.

It is an amenable number.

679926157 is a deficient number, since it is larger than the sum of its proper divisors (3930383).

679926157 is a wasteful number, since it uses less digits than its factorization.

679926157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930382.

The product of its digits is 1428840, while the sum is 52.

The square root of 679926157 is about 26075.3937074783. The cubic root of 679926157 is about 879.3341023878.

The spelling of 679926157 in words is "six hundred seventy-nine million, nine hundred twenty-six thousand, one hundred fifty-seven".