28166575 has 6 divisors (see below), whose sum is σ = 34926584. Its totient is φ = 22533240.

The previous prime is 28166561. The next prime is 28166629. The reversal of 28166575 is 57566182.

It is not a de Polignac number, because 28166575 - 2⁷ = 28166447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 563307 + ... + 563356.

Almost surely, 2^28166575 is an apocalyptic number.

28166575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28166575 is a deficient number, since it is larger than the sum of its proper divisors (6760009).

28166575 is a wasteful number, since it uses less digits than its factorization.

28166575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126673 (or 1126668 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 28166575 is about 5307.2191400017. The cubic root of 28166575 is about 304.2598734391.

The spelling of 28166575 in words is "twenty-eight million, one hundred sixty-six thousand, five hundred seventy-five".