28684787 has 4 divisors (see below), whose sum is σ = 28744176. Its totient is φ = 28625400.

The previous prime is 28684783. The next prime is 28684801. The reversal of 28684787 is 78748682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28684787 - 2² = 28684783 is a prime.

It is a super-3 number, since 3×28684787³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28684783) 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, 28964 + ... + 29937.

It is an arithmetic number, because the mean of its divisors is an integer number (7186044).

Almost surely, 2^28684787 is an apocalyptic number.

28684787 is a deficient number, since it is larger than the sum of its proper divisors (59389).

28684787 is an equidigital number, since it uses as much as digits as its factorization.

28684787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59388.

The product of its digits is 1204224, while the sum is 50.

The square root of 28684787 is about 5355.8180514278. The cubic root of 28684787 is about 306.1144822042.

The spelling of 28684787 in words is "twenty-eight million, six hundred eighty-four thousand, seven hundred eighty-seven".