28403023 has 4 divisors (see below), whose sum is σ = 30985128. Its totient is φ = 25820920.

The previous prime is 28403021. The next prime is 28403029. The reversal of 28403023 is 32030482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28403023 - 2¹ = 28403021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28402985 and 28403003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291036 + ... + 1291057.

It is an arithmetic number, because the mean of its divisors is an integer number (7746282).

Almost surely, 2^28403023 is an apocalyptic number.

28403023 is a deficient number, since it is larger than the sum of its proper divisors (2582105).

28403023 is a wasteful number, since it uses less digits than its factorization.

28403023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582104.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 28403023 is about 5329.4486581634. The cubic root of 28403023 is about 305.1088852476.

The spelling of 28403023 in words is "twenty-eight million, four hundred three thousand, twenty-three".