28331423999 has 4 divisors (see below), whose sum is σ = 28478219136. Its totient is φ = 28184628864.

The previous prime is 28331423983. The next prime is 28331424019. The reversal of 28331423999 is 99932413382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28331423999 - 2⁴ = 28331423983 is a prime.

It is a super-2 number, since 2×28331423999² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28331423999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331423929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73397279 + ... + 73397664.

It is an arithmetic number, because the mean of its divisors is an integer number (7119554784).

Almost surely, 2^28331423999 is an apocalyptic number.

28331423999 is a deficient number, since it is larger than the sum of its proper divisors (146795137).

28331423999 is a wasteful number, since it uses less digits than its factorization.

28331423999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146795136.

The product of its digits is 2519424, while the sum is 53.

The spelling of 28331423999 in words is "twenty-eight billion, three hundred thirty-one million, four hundred twenty-three thousand, nine hundred ninety-nine".