679921345 has 8 divisors (see below), whose sum is σ = 816261480. Its totient is φ = 543699840.

The previous prime is 679921337. The next prime is 679921351. The reversal of 679921345 is 543129976.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 114575616 + 565345729 = 10704^2 + 23777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 679921345 - 2³ = 679921337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 679921295 and 679921304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16516 + ... + 40405.

It is an arithmetic number, because the mean of its divisors is an integer number (102032685).

Almost surely, 2^679921345 is an apocalyptic number.

It is an amenable number.

679921345 is a deficient number, since it is larger than the sum of its proper divisors (136340135).

679921345 is a wasteful number, since it uses less digits than its factorization.

679921345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59315.

The product of its digits is 408240, while the sum is 46.

The square root of 679921345 is about 26075.3014364168. The cubic root of 679921345 is about 879.3320279637.

The spelling of 679921345 in words is "six hundred seventy-nine million, nine hundred twenty-one thousand, three hundred forty-five".