28194417 has 12 divisors (see below), whose sum is σ = 40771380. Its totient is φ = 18775008.

The previous prime is 28194401. The next prime is 28194421. The reversal of 28194417 is 71449182.

It can be written as a sum of positive squares in 2 ways, for example, as 16353936 + 11840481 = 4044^2 + 3441^2 .

It is not a de Polignac number, because 28194417 - 2⁴ = 28194401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28194427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14083 + ... + 15959.

It is an arithmetic number, because the mean of its divisors is an integer number (3397615).

Almost surely, 2^28194417 is an apocalyptic number.

It is an amenable number.

28194417 is a deficient number, since it is larger than the sum of its proper divisors (12576963).

28194417 is a wasteful number, since it uses less digits than its factorization.

28194417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552 (or 3549 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28194417 is about 5309.8415230589. The cubic root of 28194417 is about 304.3600916793.

It can be divided in two parts, 281944 and 17, that added together give a square (281961 = 531²).

The spelling of 28194417 in words is "twenty-eight million, one hundred ninety-four thousand, four hundred seventeen".