28485223 has 4 divisors (see below), whose sum is σ = 30676408. Its totient is φ = 26294040.

The previous prime is 28485209. The next prime is 28485239. The reversal of 28485223 is 32258482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32258482 = 2 ⋅16129241.

It is a cyclic number.

It is not a de Polignac number, because 28485223 - 2⁹ = 28484711 is a prime.

It is a super-2 number, since 2×28485223² = 1622815858719458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28485203) 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, 1095573 + ... + 1095598.

It is an arithmetic number, because the mean of its divisors is an integer number (7669102).

Almost surely, 2^28485223 is an apocalyptic number.

28485223 is a deficient number, since it is larger than the sum of its proper divisors (2191185).

28485223 is a wasteful number, since it uses less digits than its factorization.

28485223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191184.

The product of its digits is 30720, while the sum is 34.

The square root of 28485223 is about 5337.1549537183. The cubic root of 28485223 is about 305.4029360477.

The spelling of 28485223 in words is "twenty-eight million, four hundred eighty-five thousand, two hundred twenty-three".