28870687 has 4 divisors (see below), whose sum is σ = 29064600. Its totient is φ = 28676776.

The previous prime is 28870669. The next prime is 28870733. The reversal of 28870687 is 78607882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28870687 - 2⁷ = 28870559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96733 + ... + 97030.

It is an arithmetic number, because the mean of its divisors is an integer number (7266150).

Almost surely, 2^28870687 is an apocalyptic number.

28870687 is a deficient number, since it is larger than the sum of its proper divisors (193913).

28870687 is a wasteful number, since it uses less digits than its factorization.

28870687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193912.

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 28870687 is about 5373.1449822241. The cubic root of 28870687 is about 306.7743463753.

The spelling of 28870687 in words is "twenty-eight million, eight hundred seventy thousand, six hundred eighty-seven".