679431658 has 4 divisors (see below), whose sum is σ = 1019147490. Its totient is φ = 339715828.

The previous prime is 679431653. The next prime is 679431667. The reversal of 679431658 is 856134976.

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

It can be written as a sum of positive squares in only one way, i.e., 597655809 + 81775849 = 24447^2 + 9043^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (679431653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169857913 + ... + 169857916.

Almost surely, 2^679431658 is an apocalyptic number.

679431658 is a deficient number, since it is larger than the sum of its proper divisors (339715832).

679431658 is a wasteful number, since it uses less digits than its factorization.

679431658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339715831.

The product of its digits is 1088640, while the sum is 49.

The square root of 679431658 is about 26065.9098824499. The cubic root of 679431658 is about 879.1208756586.

The spelling of 679431658 in words is "six hundred seventy-nine million, four hundred thirty-one thousand, six hundred fifty-eight".