28104361 has 4 divisors (see below), whose sum is σ = 28382724. Its totient is φ = 27826000.

The previous prime is 28104359. The next prime is 28104371. The reversal of 28104361 is 16340182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22610025 + 5494336 = 4755^2 + 2344^2 .

It is a cyclic number.

It is not a de Polignac number, because 28104361 - 2¹ = 28104359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28104371) 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, 139030 + ... + 139231.

It is an arithmetic number, because the mean of its divisors is an integer number (7095681).

Almost surely, 2^28104361 is an apocalyptic number.

It is an amenable number.

28104361 is a deficient number, since it is larger than the sum of its proper divisors (278363).

28104361 is a wasteful number, since it uses less digits than its factorization.

28104361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278362.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28104361 is about 5301.3546382033. The cubic root of 28104361 is about 304.0356930909.

The spelling of 28104361 in words is "twenty-eight million, one hundred four thousand, three hundred sixty-one".