28779297782 has 16 divisors (see below), whose sum is σ = 43400538720. Its totient is φ = 14312493888.

The previous prime is 28779297761. The next prime is 28779297823.

28779297782 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1728863 + ... + 1745429.

It is an arithmetic number, because the mean of its divisors is an integer number (2712533670).

Almost surely, 2^28779297782 is an apocalyptic number.

28779297782 is a deficient number, since it is larger than the sum of its proper divisors (14621240938).

28779297782 is a wasteful number, since it uses less digits than its factorization.

28779297782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21175.

The product of its digits is 99574272, while the sum is 68.

The spelling of 28779297782 in words is "twenty-eight billion, seven hundred seventy-nine million, two hundred ninety-seven thousand, seven hundred eighty-two".