28115686 has 4 divisors (see below), whose sum is σ = 42173532. Its totient is φ = 14057842.

The previous prime is 28115629. The next prime is 28115699. The reversal of 28115686 is 68651182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7028920 + ... + 7028923.

It is an arithmetic number, because the mean of its divisors is an integer number (10543383).

Almost surely, 2^28115686 is an apocalyptic number.

28115686 is a deficient number, since it is larger than the sum of its proper divisors (14057846).

28115686 is a wasteful number, since it uses less digits than its factorization.

28115686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14057845.

The product of its digits is 23040, while the sum is 37.

The square root of 28115686 is about 5302.4226538442. The cubic root of 28115686 is about 304.0765259215.

The spelling of 28115686 in words is "twenty-eight million, one hundred fifteen thousand, six hundred eighty-six".