28274805 has 32 divisors (see below), whose sum is σ = 54136320. Its totient is φ = 13919040.

The previous prime is 28274801. The next prime is 28274809. The reversal of 28274805 is 50847282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28274801) and next prime (28274809).

It is not a de Polignac number, because 28274805 - 2² = 28274801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28274805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28274801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6301 + ... + 9810.

It is an arithmetic number, because the mean of its divisors is an integer number (1691760).

Almost surely, 2^28274805 is an apocalyptic number.

It is an amenable number.

28274805 is a deficient number, since it is larger than the sum of its proper divisors (25861515).

28274805 is a wasteful number, since it uses less digits than its factorization.

28274805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16138 (or 16132 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28274805 is about 5317.4058524811. The cubic root of 28274805 is about 304.6490813098.

The spelling of 28274805 in words is "twenty-eight million, two hundred seventy-four thousand, eight hundred five".