28207089 has 16 divisors (see below), whose sum is σ = 41875200. Its totient is φ = 18765648.

The previous prime is 28207087. The next prime is 28207099. The reversal of 28207089 is 98070282.

It is not a de Polignac number, because 28207089 - 2¹ = 28207087 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28207087) 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, 18687 + ... + 20139.

It is an arithmetic number, because the mean of its divisors is an integer number (2617200).

Almost surely, 2^28207089 is an apocalyptic number.

It is an amenable number.

28207089 is a deficient number, since it is larger than the sum of its proper divisors (13668111).

28207089 is a wasteful number, since it uses less digits than its factorization.

28207089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2175 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28207089 is about 5311.0346449633. The cubic root of 28207089 is about 304.4056831334.

The spelling of 28207089 in words is "twenty-eight million, two hundred seven thousand, eighty-nine".