679901021 has 8 divisors (see below), whose sum is σ = 702336000. Its totient is φ = 657497520.

The previous prime is 679901003. The next prime is 679901051. The reversal of 679901021 is 120109976.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679901021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679901051) 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, 40940 + ... + 55098.

It is an arithmetic number, because the mean of its divisors is an integer number (87792000).

Almost surely, 2^679901021 is an apocalyptic number.

It is an amenable number.

679901021 is a deficient number, since it is larger than the sum of its proper divisors (22434979).

679901021 is a wasteful number, since it uses less digits than its factorization.

679901021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15739.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 679901021 is about 26074.9117160538. The cubic root of 679901021 is about 879.3232663021.

The spelling of 679901021 in words is "six hundred seventy-nine million, nine hundred one thousand, twenty-one".