28811623 has 2 divisors, whose sum is σ = 28811624. Its totient is φ = 28811622.

The previous prime is 28811621. The next prime is 28811659. The reversal of 28811623 is 32611882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28811623 - 2¹ = 28811621 is a prime.

Together with 28811621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28811621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14405811 + 14405812.

It is an arithmetic number, because the mean of its divisors is an integer number (14405812).

Almost surely, 2^28811623 is an apocalyptic number.

28811623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28811623 is an equidigital number, since it uses as much as digits as its factorization.

28811623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 28811623 is about 5367.6459458500. The cubic root of 28811623 is about 306.5650026639.

It can be divided in two parts, 288 and 11623, that added together give a palindrome (11911).

The spelling of 28811623 in words is "twenty-eight million, eight hundred eleven thousand, six hundred twenty-three".