28389914 has 48 divisors (see below), whose sum is σ = 53078400. Its totient is φ = 11321856.

The previous prime is 28389887. The next prime is 28389923. The reversal of 28389914 is 41998382.

It is a happy number.

It is a Curzon number.

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 in 23 ways as a sum of consecutive naturals, for example, 147002 + ... + 147194.

It is an arithmetic number, because the mean of its divisors is an integer number (1105800).

Almost surely, 2^28389914 is an apocalyptic number.

28389914 is a deficient number, since it is larger than the sum of its proper divisors (24688486).

28389914 is a wasteful number, since it uses less digits than its factorization.

28389914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 300 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 28389914 is about 5328.2186516696. The cubic root of 28389914 is about 305.0619385093.

The spelling of 28389914 in words is "twenty-eight million, three hundred eighty-nine thousand, nine hundred fourteen".