28691297266 has 32 divisors (see below), whose sum is σ = 44040902400. Its totient is φ = 14014321920.

The previous prime is 28691297249. The next prime is 28691297281. The reversal of 28691297266 is 66279219682.

It is a self number, because there is not a number n which added to its sum of digits gives 28691297266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20161831 + ... + 20163253.

It is an arithmetic number, because the mean of its divisors is an integer number (1376278200).

Almost surely, 2^28691297266 is an apocalyptic number.

28691297266 is a deficient number, since it is larger than the sum of its proper divisors (15349605134).

28691297266 is a wasteful number, since it uses less digits than its factorization.

28691297266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434.

The product of its digits is 7838208, while the sum is 58.

The spelling of 28691297266 in words is "twenty-eight billion, six hundred ninety-one million, two hundred ninety-seven thousand, two hundred sixty-six".