679139280 has 60 divisors (see below), whose sum is σ = 2280778500. Its totient is φ = 181103616.

The previous prime is 679139257. The next prime is 679139311. The reversal of 679139280 is 82931976.

It can be written as a sum of positive squares in 2 ways, for example, as 79281216 + 599858064 = 8904^2 + 24492^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×679139280² = 922460323277836800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 470905 + ... + 472344.

It is an arithmetic number, because the mean of its divisors is an integer number (38012975).

Almost surely, 2^679139280 is an apocalyptic number.

679139280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

679139280 is an abundant number, since it is smaller than the sum of its proper divisors (1601639220).

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

679139280 is a wasteful number, since it uses less digits than its factorization.

679139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943268 (or 943259 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 679139280 is about 26060.3008424692. The cubic root of 679139280 is about 878.9947543242.

The spelling of 679139280 in words is "six hundred seventy-nine million, one hundred thirty-nine thousand, two hundred eighty".