28684431 has 6 divisors (see below), whose sum is σ = 41433080. Its totient is φ = 19122948.

The previous prime is 28684417. The next prime is 28684511. The reversal of 28684431 is 13448682.

It is not a de Polignac number, because 28684431 - 2¹⁷ = 28553359 is a prime.

It is a super-2 number, since 2×28684431² = 1645593163587522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28682431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593571 + ... + 1593588.

Almost surely, 2^28684431 is an apocalyptic number.

28684431 is a deficient number, since it is larger than the sum of its proper divisors (12748649).

28684431 is a wasteful number, since it uses less digits than its factorization.

28684431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187165 (or 3187162 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28684431 is about 5355.7848164391. The cubic root of 28684431 is about 306.1132158279.

The spelling of 28684431 in words is "twenty-eight million, six hundred eighty-four thousand, four hundred thirty-one".