28685472 has 48 divisors (see below), whose sum is σ = 77061600. Its totient is φ = 9338112.

The previous prime is 28685467. The next prime is 28685473. The reversal of 28685472 is 27458682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28685473) 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, 654 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (1605450).

Almost surely, 2^28685472 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 28685472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38530800).

28685472 is an abundant number, since it is smaller than the sum of its proper divisors (48376128).

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

28685472 is a wasteful number, since it uses less digits than its factorization.

28685472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7005 (or 6997 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 28685472 is about 5355.8820001938. The cubic root of 28685472 is about 306.1169188820.

It can be divided in two parts, 286 and 85472, that added together give a palindrome (85758).

The spelling of 28685472 in words is "twenty-eight million, six hundred eighty-five thousand, four hundred seventy-two".