28662784 has 44 divisors (see below), whose sum is σ = 59837904. Its totient is φ = 13697024.

The previous prime is 28662779. The next prime is 28662787. The reversal of 28662784 is 48726682.

It is a self number, because there is not a number n which added to its sum of digits gives 28662784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28662787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22944 + ... + 24160.

Almost surely, 2^28662784 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 28662784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29918952).

28662784 is an abundant number, since it is smaller than the sum of its proper divisors (31175120).

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

28662784 is a wasteful number, since it uses less digits than its factorization.

28662784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1242 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 28662784 is about 5353.7635360557. The cubic root of 28662784 is about 306.0361926234.

The spelling of 28662784 in words is "twenty-eight million, six hundred sixty-two thousand, seven hundred eighty-four".