28274786 has 4 divisors (see below), whose sum is σ = 42412182. Its totient is φ = 14137392.

The previous prime is 28274773. The next prime is 28274801. The reversal of 28274786 is 68747282.

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

It can be written as a sum of positive squares in only one way, i.e., 18757561 + 9517225 = 4331^2 + 3085^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7068695 + ... + 7068698.

Almost surely, 2^28274786 is an apocalyptic number.

28274786 is a deficient number, since it is larger than the sum of its proper divisors (14137396).

28274786 is a wasteful number, since it uses less digits than its factorization.

28274786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14137395.

The product of its digits is 301056, while the sum is 44.

The square root of 28274786 is about 5317.4040658953. The cubic root of 28274786 is about 304.6490130707.

The spelling of 28274786 in words is "twenty-eight million, two hundred seventy-four thousand, seven hundred eighty-six".