28164285 has 24 divisors (see below), whose sum is σ = 48945624. Its totient is φ = 14981760.

The previous prime is 28164277. The next prime is 28164293. The reversal of 28164285 is 58246182.

28164285 is a `hidden beast` number, since 2 + 8 + 1 + 642 + 8 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (28164277) and next prime (28164293).

It can be written as a sum of positive squares in 4 ways, for example, as 36 + 28164249 = 6^2 + 5307^2 .

It is not a de Polignac number, because 28164285 - 2³ = 28164277 is a prime.

It is a super-2 number, since 2×28164285² = 1586453899122450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27075 + ... + 28095.

It is an arithmetic number, because the mean of its divisors is an integer number (2039401).

Almost surely, 2^28164285 is an apocalyptic number.

It is an amenable number.

28164285 is a deficient number, since it is larger than the sum of its proper divisors (20781339).

28164285 is a wasteful number, since it uses less digits than its factorization.

28164285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1642 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28164285 is about 5307.0033917457. The cubic root of 28164285 is about 304.2516275662.

Subtracting from 28164285 its sum of digits (36), we obtain a square (28164249 = 5307²).

The spelling of 28164285 in words is "twenty-eight million, one hundred sixty-four thousand, two hundred eighty-five".