28686423730923 has 24 divisors (see below), whose sum is σ = 47356189740288. Its totient is φ = 16391957046192.

The previous prime is 28686423730879. The next prime is 28686423730927. The reversal of 28686423730923 is 32903732468682.

28686423730923 is a `hidden beast` number, since 2 + 86 + 86 + 423 + 7 + 30 + 9 + 23 = 666.

It is not a de Polignac number, because 28686423730923 - 2¹⁴ = 28686423714539 is a prime.

It is a super-2 number, since 2×28686423730923² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (28686423730927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281415 + ... + 7579712.

It is an arithmetic number, because the mean of its divisors is an integer number (1973174572512).

Almost surely, 2^{28686423730923} is an apocalyptic number.

28686423730923 is a deficient number, since it is larger than the sum of its proper divisors (18669766009365).

28686423730923 is a wasteful number, since it uses less digits than its factorization.

28686423730923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919063 (or 7919060 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 63.

The spelling of 28686423730923 in words is "twenty-eight trillion, six hundred eighty-six billion, four hundred twenty-three million, seven hundred thirty thousand, nine hundred twenty-three".