28270188 has 24 divisors (see below), whose sum is σ = 73293360. Its totient is φ = 9423360.

The previous prime is 28270169. The next prime is 28270189. The reversal of 28270188 is 88107282.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28270189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130773 + ... + 130988.

It is an arithmetic number, because the mean of its divisors is an integer number (3053890).

Almost surely, 2^28270188 is an apocalyptic number.

It is an amenable number.

28270188 is an abundant number, since it is smaller than the sum of its proper divisors (45023172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28270188 is a wasteful number, since it uses less digits than its factorization.

28270188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261774 (or 261766 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28270188 is about 5316.9716944893. The cubic root of 28270188 is about 304.6324983321.

The spelling of 28270188 in words is "twenty-eight million, two hundred seventy thousand, one hundred eighty-eight".