28905874 has 4 divisors (see below), whose sum is σ = 43358814. Its totient is φ = 14452936.

The previous prime is 28905853. The next prime is 28905907. The reversal of 28905874 is 47850982.

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., 26368225 + 2537649 = 5135^2 + 1593^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28905874.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7226467 + ... + 7226470.

Almost surely, 2^28905874 is an apocalyptic number.

28905874 is a deficient number, since it is larger than the sum of its proper divisors (14452940).

28905874 is a wasteful number, since it uses less digits than its factorization.

28905874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14452939.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28905874 is about 5376.4183244982. The cubic root of 28905874 is about 306.8989258670.

The spelling of 28905874 in words is "twenty-eight million, nine hundred five thousand, eight hundred seventy-four".