28940814 has 96 divisors (see below), whose sum is σ = 76317696. Its totient is φ = 8048160.

The previous prime is 28940797. The next prime is 28940881. The reversal of 28940814 is 41804982.

It is a congruent 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 in 47 ways as a sum of consecutive naturals, for example, 159804 + ... + 159984.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^28940814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28940814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38158848).

28940814 is an abundant number, since it is smaller than the sum of its proper divisors (47376882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28940814 is a wasteful number, since it uses less digits than its factorization.

28940814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28940814 is about 5379.6667183014. Note that the first 3 decimals coincide. The cubic root of 28940814 is about 307.0225308578.

The spelling of 28940814 in words is "twenty-eight million, nine hundred forty thousand, eight hundred fourteen".