679220842 has 8 divisors (see below), whose sum is σ = 1043680932. Its totient is φ = 331327200.

The previous prime is 679220827. The next prime is 679220849. The reversal of 679220842 is 248022976.

It can be written as a sum of positive squares in 2 ways, for example, as 575568081 + 103652761 = 23991^2 + 10181^2 .

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

It is a super-2 number, since 2×679220842² = 922681904414377928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 679220795 and 679220804.

It is not an unprimeable number, because it can be changed into a prime (679220849) 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, 4141509 + ... + 4141672.

Almost surely, 2^679220842 is an apocalyptic number.

679220842 is a deficient number, since it is larger than the sum of its proper divisors (364460090).

679220842 is a wasteful number, since it uses less digits than its factorization.

679220842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8283224.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 679220842 is about 26061.8656661414. The cubic root of 679220842 is about 879.0299408721.

The spelling of 679220842 in words is "six hundred seventy-nine million, two hundred twenty thousand, eight hundred forty-two".