28165489 has 4 divisors (see below), whose sum is σ = 30726000. Its totient is φ = 25604980.

The previous prime is 28165477. The next prime is 28165493. The reversal of 28165489 is 98456182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28165489 - 2⁵ = 28165457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165499) 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, 1280239 + ... + 1280260.

It is an arithmetic number, because the mean of its divisors is an integer number (7681500).

Almost surely, 2^28165489 is an apocalyptic number.

It is an amenable number.

28165489 is a deficient number, since it is larger than the sum of its proper divisors (2560511).

28165489 is a wasteful number, since it uses less digits than its factorization.

28165489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560510.

The product of its digits is 138240, while the sum is 43.

The square root of 28165489 is about 5307.1168255466. The cubic root of 28165489 is about 304.2559630067.

The spelling of 28165489 in words is "twenty-eight million, one hundred sixty-five thousand, four hundred eighty-nine".