28684351 has 4 divisors (see below), whose sum is σ = 28699272. Its totient is φ = 28669432.

The previous prime is 28684349. The next prime is 28684363. The reversal of 28684351 is 15348682.

It is a happy number.

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 28684351 - 2¹ = 28684349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28684351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684651) 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, 4060 + ... + 8593.

It is an arithmetic number, because the mean of its divisors is an integer number (7174818).

Almost surely, 2^28684351 is an apocalyptic number.

28684351 is a deficient number, since it is larger than the sum of its proper divisors (14921).

28684351 is a wasteful number, since it uses less digits than its factorization.

28684351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14920.

The product of its digits is 46080, while the sum is 37.

The square root of 28684351 is about 5355.7773478740. Note that the first 3 decimals coincide. The cubic root of 28684351 is about 306.1129312475.

The spelling of 28684351 in words is "twenty-eight million, six hundred eighty-four thousand, three hundred fifty-one".