28919023 has 16 divisors (see below), whose sum is σ = 35484480. Its totient is φ = 23003136.

The previous prime is 28919017. The next prime is 28919039. The reversal of 28919023 is 32091982.

It is a cyclic number.

It is not a de Polignac number, because 28919023 - 2⁹ = 28918511 is a prime.

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 28919023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7023 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (2217780).

Almost surely, 2^28919023 is an apocalyptic number.

28919023 is a deficient number, since it is larger than the sum of its proper divisors (6565457).

28919023 is a wasteful number, since it uses less digits than its factorization.

28919023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28919023 is about 5377.6410255799. The cubic root of 28919023 is about 306.9454539215.

The spelling of 28919023 in words is "twenty-eight million, nine hundred nineteen thousand, twenty-three".