28981249 has 16 divisors (see below), whose sum is σ = 33532416. Its totient is φ = 24796800.

The previous prime is 28981241. The next prime is 28981259. The reversal of 28981249 is 94218982.

It is a cyclic number.

It is not a de Polignac number, because 28981249 - 2³ = 28981241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28981241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11469 + ... + 13765.

It is an arithmetic number, because the mean of its divisors is an integer number (2095776).

Almost surely, 2^28981249 is an apocalyptic number.

It is an amenable number.

28981249 is a deficient number, since it is larger than the sum of its proper divisors (4551167).

28981249 is a wasteful number, since it uses less digits than its factorization.

28981249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its digits is 82944, while the sum is 43.

The square root of 28981249 is about 5383.4235389759. The cubic root of 28981249 is about 307.1654510356.

The spelling of 28981249 in words is "twenty-eight million, nine hundred eighty-one thousand, two hundred forty-nine".