28165913 has 4 divisors (see below), whose sum is σ = 28562688. Its totient is φ = 27769140.

The previous prime is 28165909. The next prime is 28165937. The reversal of 28165913 is 31956182.

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 28165913 - 2² = 28165909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165013) 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, 198281 + ... + 198422.

It is an arithmetic number, because the mean of its divisors is an integer number (7140672).

Almost surely, 2^28165913 is an apocalyptic number.

It is an amenable number.

28165913 is a deficient number, since it is larger than the sum of its proper divisors (396775).

28165913 is an equidigital number, since it uses as much as digits as its factorization.

28165913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396774.

The product of its digits is 12960, while the sum is 35.

The square root of 28165913 is about 5307.1567717564. The cubic root of 28165913 is about 304.2574897436.

The spelling of 28165913 in words is "twenty-eight million, one hundred sixty-five thousand, nine hundred thirteen".