28812123 has 24 divisors (see below), whose sum is σ = 43723680. Its totient is φ = 18247680.

The previous prime is 28812101. The next prime is 28812137. The reversal of 28812123 is 32121882.

It is not a de Polignac number, because 28812123 - 2¹⁰ = 28811099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28812163) 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, 37083 + ... + 37851.

It is an arithmetic number, because the mean of its divisors is an integer number (1821820).

Almost surely, 2^28812123 is an apocalyptic number.

28812123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28812123 is a deficient number, since it is larger than the sum of its proper divisors (14911557).

28812123 is a wasteful number, since it uses less digits than its factorization.

28812123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 976 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 28812123 is about 5367.6925210001. The cubic root of 28812123 is about 306.5667760410.

The spelling of 28812123 in words is "twenty-eight million, eight hundred twelve thousand, one hundred twenty-three".