28941813 has 8 divisors (see below), whose sum is σ = 42876800. Its totient is φ = 19294524.

The previous prime is 28941779. The next prime is 28941823. The reversal of 28941813 is 31814982.

It is not a de Polignac number, because 28941813 - 2⁶ = 28941749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28941823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535933 + ... + 535986.

It is an arithmetic number, because the mean of its divisors is an integer number (5359600).

Almost surely, 2^28941813 is an apocalyptic number.

It is an amenable number.

28941813 is a deficient number, since it is larger than the sum of its proper divisors (13934987).

28941813 is a wasteful number, since it uses less digits than its factorization.

28941813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071928 (or 1071922 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28941813 is about 5379.7595671182. The cubic root of 28941813 is about 307.0260634926.

The spelling of 28941813 in words is "twenty-eight million, nine hundred forty-one thousand, eight hundred thirteen".