28188147 has 16 divisors (see below), whose sum is σ = 41033888. Its totient is φ = 17107200.

The previous prime is 28188143. The next prime is 28188157. The reversal of 28188147 is 74188182.

It is a happy number.

It is not a de Polignac number, because 28188147 - 2² = 28188143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28188143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2104 + ... + 7797.

It is an arithmetic number, because the mean of its divisors is an integer number (2564618).

Almost surely, 2^28188147 is an apocalyptic number.

28188147 is a deficient number, since it is larger than the sum of its proper divisors (12845741).

28188147 is a wasteful number, since it uses less digits than its factorization.

28188147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9990.

The product of its digits is 28672, while the sum is 39.

The square root of 28188147 is about 5309.2510771294. The cubic root of 28188147 is about 304.3375283558.

The spelling of 28188147 in words is "twenty-eight million, one hundred eighty-eight thousand, one hundred forty-seven".