28166188 has 6 divisors (see below), whose sum is σ = 49290836. Its totient is φ = 14083092.

The previous prime is 28166167. The next prime is 28166209. The reversal of 28166188 is 88166182.

It is an interprime number because it is at equal distance from previous prime (28166167) and next prime (28166209).

It is a self number, because there is not a number n which added to its sum of digits gives 28166188.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3520770 + ... + 3520777.

Almost surely, 2^28166188 is an apocalyptic number.

It is an amenable number.

28166188 is a deficient number, since it is larger than the sum of its proper divisors (21124648).

28166188 is a wasteful number, since it uses less digits than its factorization.

28166188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041551 (or 7041549 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 28166188 is about 5307.1826801044. The cubic root of 28166188 is about 304.2584799540.

The spelling of 28166188 in words is "twenty-eight million, one hundred sixty-six thousand, one hundred eighty-eight".