28817856623 has 2 divisors, whose sum is σ = 28817856624. Its totient is φ = 28817856622.

The previous prime is 28817856583. The next prime is 28817856737. The reversal of 28817856623 is 32665871882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28817856623 - 2⁶ = 28817856559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28817876623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14408928311 + 14408928312.

It is an arithmetic number, because the mean of its divisors is an integer number (14408928312).

Almost surely, 2^28817856623 is an apocalyptic number.

28817856623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28817856623 is an equidigital number, since it uses as much as digits as its factorization.

28817856623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 56.

The spelling of 28817856623 in words is "twenty-eight billion, eight hundred seventeen million, eight hundred fifty-six thousand, six hundred twenty-three".