28923111 has 48 divisors (see below), whose sum is σ = 51101440. Its totient is φ = 15396480.

The previous prime is 28923091. The next prime is 28923113. The reversal of 28923111 is 11132982.

It is not a de Polignac number, because 28923111 - 2⁵ = 28923079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28923113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87216 + ... + 87546.

Almost surely, 2^28923111 is an apocalyptic number.

28923111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28923111 is a deficient number, since it is larger than the sum of its proper divisors (22178329).

28923111 is a wasteful number, since it uses less digits than its factorization.

28923111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 433 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 28923111 is about 5378.0211044584. The cubic root of 28923111 is about 306.9599165342.

The spelling of 28923111 in words is "twenty-eight million, nine hundred twenty-three thousand, one hundred eleven".