28909894 has 16 divisors (see below), whose sum is σ = 49448448. Its totient is φ = 12557952.

The previous prime is 28909891. The next prime is 28909921. The reversal of 28909894 is 49890982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28909891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32262 + ... + 33145.

It is an arithmetic number, because the mean of its divisors is an integer number (3090528).

Almost surely, 2^28909894 is an apocalyptic number.

28909894 is a deficient number, since it is larger than the sum of its proper divisors (20538554).

28909894 is a wasteful number, since it uses less digits than its factorization.

28909894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65439.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 28909894 is about 5376.7921663386. The cubic root of 28909894 is about 306.9131522314.

The spelling of 28909894 in words is "twenty-eight million, nine hundred nine thousand, eight hundred ninety-four".