28384345 has 16 divisors (see below), whose sum is σ = 37438848. Its totient is φ = 20487040.

The previous prime is 28384303. The next prime is 28384379. The reversal of 28384345 is 54348382.

28384345 is a nontrivial binomial coefficient, being equal to C(7535, 2).

It is not a de Polignac number, because 28384345 - 2¹⁷ = 28253273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5652 + ... + 9418.

It is an arithmetic number, because the mean of its divisors is an integer number (2339928).

Almost surely, 2^28384345 is an apocalyptic number.

28384345 is the 7534-th triangular number.

28384345 is the 2512-nd centered nonagonal number.

It is an amenable number.

28384345 is a deficient number, since it is larger than the sum of its proper divisors (9054503).

28384345 is a wasteful number, since it uses less digits than its factorization.

28384345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920.

The product of its digits is 92160, while the sum is 37.

The square root of 28384345 is about 5327.6960311189. The cubic root of 28384345 is about 305.0419900981.

The spelling of 28384345 in words is "twenty-eight million, three hundred eighty-four thousand, three hundred forty-five".