279489680 has 80 divisors (see below), whose sum is σ = 671742720. Its totient is φ = 108079104.

The previous prime is 279489659. The next prime is 279489703. The reversal of 279489680 is 86984972.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×279489680² = 156228962453004800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388361 + ... + 389079.

It is an arithmetic number, because the mean of its divisors is an integer number (8396784).

Almost surely, 2^279489680 is an apocalyptic number.

279489680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 279489680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335871360).

279489680 is an abundant number, since it is smaller than the sum of its proper divisors (392253040).

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

279489680 is a wasteful number, since it uses less digits than its factorization.

279489680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 279489680 is about 16717.9448497715. The cubic root of 279489680 is about 653.8155701993.

The spelling of 279489680 in words is "two hundred seventy-nine million, four hundred eighty-nine thousand, six hundred eighty".