28085472 has 72 divisors (see below), whose sum is σ = 80668224. Its totient is φ = 9268224.

The previous prime is 28085459. The next prime is 28085489. The reversal of 28085472 is 27458082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

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

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 11 ways as a sum of consecutive naturals, for example, 32113 + ... + 32975.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^28085472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28085472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40334112).

28085472 is an abundant number, since it is smaller than the sum of its proper divisors (52582752).

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

28085472 is a wasteful number, since it uses less digits than its factorization.

28085472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28085472 is about 5299.5728129728. The cubic root of 28085472 is about 303.9675634829.

The spelling of 28085472 in words is "twenty-eight million, eighty-five thousand, four hundred seventy-two".