679218440 has 32 divisors (see below), whose sum is σ = 1529847000. Its totient is φ = 271401984.

The previous prime is 679218439. The next prime is 679218457. The reversal of 679218440 is 44812976.

It can be written as a sum of positive squares in 4 ways, for example, as 272712196 + 406506244 = 16514^2 + 20162^2 .

It is a super-2 number, since 2×679218440² = 922675378472067200, which contains 22 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 31946 + ... + 48774.

Almost surely, 2^679218440 is an apocalyptic number.

It is an amenable number.

679218440 is an abundant number, since it is smaller than the sum of its proper divisors (850628560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

679218440 is a wasteful number, since it uses less digits than its factorization.

679218440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17849 (or 17845 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 679218440 is about 26061.8195834443. The cubic root of 679218440 is about 879.0289046689.

The spelling of 679218440 in words is "six hundred seventy-nine million, two hundred eighteen thousand, four hundred forty".