28447188 has 96 divisors (see below), whose sum is σ = 87671808. Its totient is φ = 6950400.

The previous prime is 28447169. The next prime is 28447201. The reversal of 28447188 is 88174482.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 in 31 ways as a sum of consecutive naturals, for example, 14803 + ... + 16613.

It is an arithmetic number, because the mean of its divisors is an integer number (913248).

Almost surely, 2^28447188 is an apocalyptic number.

28447188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28447188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43835904).

28447188 is an abundant number, since it is smaller than the sum of its proper divisors (59224620).

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

28447188 is a wasteful number, since it uses less digits than its factorization.

28447188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853 (or 1851 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 28447188 is about 5333.5905354648. The cubic root of 28447188 is about 305.2669453668.

The spelling of 28447188 in words is "twenty-eight million, four hundred forty-seven thousand, one hundred eighty-eight".