1279630320 has 80 divisors (see below), whose sum is σ = 4026111360. Its totient is φ = 336137472.

The previous prime is 1279630241. The next prime is 1279630333. The reversal of 1279630320 is 230369721.

It is a happy number.

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

It is a congruent number.

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, 23710 + ... + 55869.

It is an arithmetic number, because the mean of its divisors is an integer number (50326392).

Almost surely, 2^1279630320 is an apocalyptic number.

1279630320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279630320 is an abundant number, since it is smaller than the sum of its proper divisors (2746481040).

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

1279630320 is a wasteful number, since it uses less digits than its factorization.

1279630320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79662 (or 79656 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 1279630320 is about 35771.9208318480. The cubic root of 1279630320 is about 1085.6625088750.

The spelling of 1279630320 in words is "one billion, two hundred seventy-nine million, six hundred thirty thousand, three hundred twenty".