28979985 has 16 divisors (see below), whose sum is σ = 49095936. Its totient is φ = 14546688.

The previous prime is 28979983. The next prime is 28980013. The reversal of 28979985 is 58997982.

It is not a de Polignac number, because 28979985 - 2¹ = 28979983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28979983) 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, 56569 + ... + 57078.

It is an arithmetic number, because the mean of its divisors is an integer number (3068496).

Almost surely, 2^28979985 is an apocalyptic number.

It is an amenable number.

28979985 is a deficient number, since it is larger than the sum of its proper divisors (20115951).

28979985 is a wasteful number, since it uses less digits than its factorization.

28979985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113672.

The product of its digits is 3265920, while the sum is 57.

The square root of 28979985 is about 5383.3061402822. The cubic root of 28979985 is about 307.1609853577.

The spelling of 28979985 in words is "twenty-eight million, nine hundred seventy-nine thousand, nine hundred eighty-five".