28681992 has 128 divisors (see below), whose sum is σ = 86313600. Its totient is φ = 8792064.

The previous prime is 28681967. The next prime is 28682011. The reversal of 28681992 is 29918682.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268003 + ... + 268109.

It is an arithmetic number, because the mean of its divisors is an integer number (674325).

Almost surely, 2^28681992 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 28681992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43156800).

28681992 is an abundant number, since it is smaller than the sum of its proper divisors (57631608).

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

28681992 is a wasteful number, since it uses less digits than its factorization.

28681992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 202 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 28681992 is about 5355.5571138771. The cubic root of 28681992 is about 306.1045394453.

The spelling of 28681992 in words is "twenty-eight million, six hundred eighty-one thousand, nine hundred ninety-two".