1279628669 has 16 divisors (see below), whose sum is σ = 1422976896. Its totient is φ = 1140955200.

The previous prime is 1279628629. The next prime is 1279628671. The reversal of 1279628669 is 9668269721.

It is a happy number.

It is not a de Polignac number, because 1279628669 - 2²⁸ = 1011193213 is a prime.

It is a super-2 number, since 2×1279628669² = 3274899061053423122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279628629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149699 + ... + 158015.

It is an arithmetic number, because the mean of its divisors is an integer number (88936056).

Almost surely, 2^1279628669 is an apocalyptic number.

It is an amenable number.

1279628669 is a deficient number, since it is larger than the sum of its proper divisors (143348227).

1279628669 is a wasteful number, since it uses less digits than its factorization.

1279628669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8596.

The product of its digits is 3919104, while the sum is 56.

The square root of 1279628669 is about 35771.8977550814. The cubic root of 1279628669 is about 1085.6620419616.

It can be divided in two parts, 127962 and 8669, that added together give a palindrome (136631).

The spelling of 1279628669 in words is "one billion, two hundred seventy-nine million, six hundred twenty-eight thousand, six hundred sixty-nine".