679221756 has 36 divisors (see below), whose sum is σ = 1732126032. Its totient is φ = 224402304.

The previous prime is 679221743. The next prime is 679221761. The reversal of 679221756 is 657122976.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×679221756² = 922684387647447072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79416 + ... + 87551.

It is an arithmetic number, because the mean of its divisors is an integer number (48114612).

Almost surely, 2^679221756 is an apocalyptic number.

It is an amenable number.

679221756 is an abundant number, since it is smaller than the sum of its proper divisors (1052904276).

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

679221756 is a wasteful number, since it uses less digits than its factorization.

679221756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167090 (or 167085 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 679221756 is about 26061.8832013345. The cubic root of 679221756 is about 879.0303351636.

The spelling of 679221756 in words is "six hundred seventy-nine million, two hundred twenty-one thousand, seven hundred fifty-six".