28684686 has 8 divisors (see below), whose sum is σ = 57369384. Its totient is φ = 9561560.

The previous prime is 28684681. The next prime is 28684709. The reversal of 28684686 is 68648682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

28684686 is an admirable number.

It is a super-4 number, since 4×28684686⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684681) 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, 2390385 + ... + 2390396.

It is an arithmetic number, because the mean of its divisors is an integer number (7171173).

Almost surely, 2^28684686 is an apocalyptic number.

28684686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28684686 is a wasteful number, since it uses less digits than its factorization.

28684686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780786.

The product of its digits is 884736, while the sum is 48.

The square root of 28684686 is about 5355.8086224211. The cubic root of 28684686 is about 306.1141229244.

The spelling of 28684686 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred eighty-six".