28367905 has 8 divisors (see below), whose sum is σ = 34290792. Its totient is φ = 22528128.

The previous prime is 28367903. The next prime is 28367909. The reversal of 28367905 is 50976382.

It can be written as a sum of positive squares in 4 ways, for example, as 7134241 + 21233664 = 2671^2 + 4608^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28367905 - 2¹ = 28367903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28367903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20022 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (4286349).

Almost surely, 2^28367905 is an apocalyptic number.

It is an amenable number.

28367905 is a deficient number, since it is larger than the sum of its proper divisors (5922887).

28367905 is a wasteful number, since it uses less digits than its factorization.

28367905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41555.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28367905 is about 5326.1529268319. The cubic root of 28367905 is about 304.9830860458.

The spelling of 28367905 in words is "twenty-eight million, three hundred sixty-seven thousand, nine hundred five".