1279728260 has 12 divisors (see below), whose sum is σ = 2687429388. Its totient is φ = 511891296.

The previous prime is 1279728259. The next prime is 1279728271. The reversal of 1279728260 is 628279721.

It can be written as a sum of positive squares in 2 ways, for example, as 418775296 + 860952964 = 20464^2 + 29342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31993187 + ... + 31993226.

It is an arithmetic number, because the mean of its divisors is an integer number (223952449).

Almost surely, 2^1279728260 is an apocalyptic number.

1279728260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279728260 is an abundant number, since it is smaller than the sum of its proper divisors (1407701128).

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

1279728260 is a wasteful number, since it uses less digits than its factorization.

1279728260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63986422 (or 63986420 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1279728260 is about 35773.2897564649. The cubic root of 1279728260 is about 1085.6902062164.

The spelling of 1279728260 in words is "one billion, two hundred seventy-nine million, seven hundred twenty-eight thousand, two hundred sixty".