28165427 has 4 divisors (see below), whose sum is σ = 28180776. Its totient is φ = 28150080.

The previous prime is 28165421. The next prime is 28165441. The reversal of 28165427 is 72456182.

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 28165427 - 2⁴ = 28165411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165421) 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, 4478 + ... + 8739.

It is an arithmetic number, because the mean of its divisors is an integer number (7045194).

Almost surely, 2^28165427 is an apocalyptic number.

28165427 is a deficient number, since it is larger than the sum of its proper divisors (15349).

28165427 is a wasteful number, since it uses less digits than its factorization.

28165427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15348.

The product of its digits is 26880, while the sum is 35.

The square root of 28165427 is about 5307.1109843304. The cubic root of 28165427 is about 304.2557397561.

The spelling of 28165427 in words is "twenty-eight million, one hundred sixty-five thousand, four hundred twenty-seven".