28681884 has 96 divisors (see below), whose sum is σ = 92736000. Its totient is φ = 7447680.

The previous prime is 28681871. The next prime is 28681921. The reversal of 28681884 is 48818682.

It is a happy number.

It is a congruent number.

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, 6592 + ... + 10040.

It is an arithmetic number, because the mean of its divisors is an integer number (966000).

Almost surely, 2^28681884 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 28681884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46368000).

28681884 is an abundant number, since it is smaller than the sum of its proper divisors (64054116).

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

28681884 is a wasteful number, since it uses less digits than its factorization.

28681884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480 (or 3472 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 28681884 is about 5355.5470308830. The cubic root of 28681884 is about 306.1041552399.

The spelling of 28681884 in words is "twenty-eight million, six hundred eighty-one thousand, eight hundred eighty-four".