28638792899 has 32 divisors (see below), whose sum is σ = 30586982400. Its totient is φ = 26774167680.

The previous prime is 28638792887. The next prime is 28638792901. The reversal of 28638792899 is 99829783682.

It is a Cunningham number, because it is equal to 169230²-1.

It is a cyclic number.

It is not a de Polignac number, because 28638792899 - 2²⁴ = 28622015683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28638792829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38753072 + ... + 38753810.

It is an arithmetic number, because the mean of its divisors is an integer number (955843200).

Almost surely, 2^28638792899 is an apocalyptic number.

28638792899 is a deficient number, since it is larger than the sum of its proper divisors (1948189501).

28638792899 is a wasteful number, since it uses less digits than its factorization.

28638792899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its digits is 188116992, while the sum is 71.

The spelling of 28638792899 in words is "twenty-eight billion, six hundred thirty-eight million, seven hundred ninety-two thousand, eight hundred ninety-nine".