28686151 has 4 divisors (see below), whose sum is σ = 30892792. Its totient is φ = 26479512.

The previous prime is 28686127. The next prime is 28686167. The reversal of 28686151 is 15168682.

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 28686151 - 2⁷ = 28686023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28686151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686551) 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, 1103301 + ... + 1103326.

It is an arithmetic number, because the mean of its divisors is an integer number (7723198).

Almost surely, 2^28686151 is an apocalyptic number.

28686151 is a deficient number, since it is larger than the sum of its proper divisors (2206641).

28686151 is a wasteful number, since it uses less digits than its factorization.

28686151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206640.

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

The square root of 28686151 is about 5355.9453880711. The cubic root of 28686151 is about 306.1193341784.

The spelling of 28686151 in words is "twenty-eight million, six hundred eighty-six thousand, one hundred fifty-one".