28267905 has 8 divisors (see below), whose sum is σ = 45228672. Its totient is φ = 15076208.

The previous prime is 28267867. The next prime is 28267907. The reversal of 28267905 is 50976282.

It is a happy number.

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 28267905 - 2⁷ = 28267777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28267907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942249 + ... + 942278.

It is an arithmetic number, because the mean of its divisors is an integer number (5653584).

Almost surely, 2^28267905 is an apocalyptic number.

It is an amenable number.

28267905 is a deficient number, since it is larger than the sum of its proper divisors (16960767).

28267905 is a wasteful number, since it uses less digits than its factorization.

28267905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884535.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 28267905 is about 5316.7570002775. The cubic root of 28267905 is about 304.6242977651.

It can be divided in two parts, 2826 and 7905, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 28267905 in words is "twenty-eight million, two hundred sixty-seven thousand, nine hundred five".