28684407 has 8 divisors (see below), whose sum is σ = 38377584. Its totient is φ = 19057088.

The previous prime is 28684387. The next prime is 28684417. The reversal of 28684407 is 70448682.

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

It is a cyclic number.

It is not a de Polignac number, because 28684407 - 2¹¹ = 28682359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15438 + ... + 17195.

It is an arithmetic number, because the mean of its divisors is an integer number (4797198).

Almost surely, 2^28684407 is an apocalyptic number.

28684407 is a deficient number, since it is larger than the sum of its proper divisors (9693177).

28684407 is a wasteful number, since it uses less digits than its factorization.

28684407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32929.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 28684407 is about 5355.7825758707. The cubic root of 28684407 is about 306.1131304538.

The spelling of 28684407 in words is "twenty-eight million, six hundred eighty-four thousand, four hundred seven".