679638 has 16 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 225096.

The previous prime is 679633. The next prime is 679639. The reversal of 679638 is 836976.

It is a super-2 number, since 2×679638² = 923815622088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 679596 and 679605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2⁶⁷⁹⁶³⁸ is an apocalyptic number.

679638 is an abundant number, since it is smaller than the sum of its proper divisors (688362).

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

679638 is a wasteful number, since it uses less digits than its factorization.

679638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its digits is 54432, while the sum is 39.

The square root of 679638 is about 824.4016011629. The cubic root of 679638 is about 87.9209862386.

The spelling of 679638 in words is "six hundred seventy-nine thousand, six hundred thirty-eight".