28684992 has 84 divisors (see below), whose sum is σ = 88315800. Its totient is φ = 8193024.

The previous prime is 28684991. The next prime is 28685021. The reversal of 28684992 is 29948682.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (28684991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7884 + ... + 10932.

Almost surely, 2^28684992 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 28684992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44157900).

28684992 is an abundant number, since it is smaller than the sum of its proper divisors (59630808).

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

28684992 is a wasteful number, since it uses less digits than its factorization.

28684992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078 (or 3061 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 28684992 is about 5355.8371894597. The cubic root of 28684992 is about 306.1152114331.

The spelling of 28684992 in words is "twenty-eight million, six hundred eighty-four thousand, nine hundred ninety-two".