28155423 has 16 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 18492000.

The previous prime is 28155389. The next prime is 28155461. The reversal of 28155423 is 32455182.

It is not a de Polignac number, because 28155423 - 2⁸ = 28155167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155823) 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, 104533 + ... + 104801.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^28155423 is an apocalyptic number.

28155423 is a deficient number, since it is larger than the sum of its proper divisors (9946977).

28155423 is a wasteful number, since it uses less digits than its factorization.

28155423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 9600, while the sum is 30.

The square root of 28155423 is about 5306.1683915986. The cubic root of 28155423 is about 304.2197129059.

The spelling of 28155423 in words is "twenty-eight million, one hundred fifty-five thousand, four hundred twenty-three".