28187119 has 4 divisors (see below), whose sum is σ = 28304320. Its totient is φ = 28069920.

The previous prime is 28187113. The next prime is 28187123. The reversal of 28187119 is 91178182.

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 28187119 - 2³ = 28187111 is a prime.

It is a super-2 number, since 2×28187119² = 1589027355040322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187111) 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, 58239 + ... + 58720.

It is an arithmetic number, because the mean of its divisors is an integer number (7076080).

Almost surely, 2^28187119 is an apocalyptic number.

28187119 is a deficient number, since it is larger than the sum of its proper divisors (117201).

28187119 is a wasteful number, since it uses less digits than its factorization.

28187119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117200.

The product of its digits is 8064, while the sum is 37.

The square root of 28187119 is about 5309.1542640989. The cubic root of 28187119 is about 304.3338286591. Note that the first 3 decimals are identical.

The spelling of 28187119 in words is "twenty-eight million, one hundred eighty-seven thousand, one hundred nineteen".