28309084 has 12 divisors (see below), whose sum is σ = 49704424. Its totient is φ = 14107824.

The previous prime is 28309081. The next prime is 28309103. The reversal of 28309084 is 48090382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28309081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10299 + ... + 12754.

Almost surely, 2^28309084 is an apocalyptic number.

It is an amenable number.

28309084 is a deficient number, since it is larger than the sum of its proper divisors (21395340).

28309084 is a wasteful number, since it uses less digits than its factorization.

28309084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23364 (or 23362 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28309084 is about 5320.6281584039. The cubic root of 28309084 is about 304.7721455063.

Subtracting from 28309084 its sum of digits (34), we obtain a triangular number (28309050 = T₇₅₂₄).

The spelling of 28309084 in words is "twenty-eight million, three hundred nine thousand, eighty-four".