28689087 has 16 divisors (see below), whose sum is σ = 44272640. Its totient is φ = 16185312.

The previous prime is 28689077. The next prime is 28689113. The reversal of 28689087 is 78098682.

It is a happy number.

It is not a de Polignac number, because 28689087 - 2⁴ = 28689071 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28689077) 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, 6988 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (2767040).

Almost surely, 2^28689087 is an apocalyptic number.

28689087 is a deficient number, since it is larger than the sum of its proper divisors (15583553).

28689087 is a wasteful number, since it uses less digits than its factorization.

28689087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17382.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 28689087 is about 5356.2194689912. The cubic root of 28689087 is about 306.1297774954.

The spelling of 28689087 in words is "twenty-eight million, six hundred eighty-nine thousand, eighty-seven".