28188164 has 6 divisors (see below), whose sum is σ = 49329294. Its totient is φ = 14094080.

The previous prime is 28188157. The next prime is 28188221. The reversal of 28188164 is 46188182.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 1459264 = 5170^2 + 1208^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3523517 + ... + 3523524.

It is an arithmetic number, because the mean of its divisors is an integer number (8221549).

Almost surely, 2^28188164 is an apocalyptic number.

It is an amenable number.

28188164 is a deficient number, since it is larger than the sum of its proper divisors (21141130).

28188164 is a wasteful number, since it uses less digits than its factorization.

28188164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047045 (or 7047043 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 28188164 is about 5309.2526781083. The cubic root of 28188164 is about 304.3375895368.

The spelling of 28188164 in words is "twenty-eight million, one hundred eighty-eight thousand, one hundred sixty-four".