28406844 has 36 divisors (see below), whose sum is σ = 72452016. Its totient is φ = 9383808.

The previous prime is 28406839. The next prime is 28406879. The reversal of 28406844 is 44860482.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28406799 and 28406808.

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 11 ways as a sum of consecutive naturals, for example, 577 + ... + 7559.

It is an arithmetic number, because the mean of its divisors is an integer number (2012556).

Almost surely, 2^28406844 is an apocalyptic number.

It is an amenable number.

28406844 is an abundant number, since it is smaller than the sum of its proper divisors (44045172).

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

28406844 is a wasteful number, since it uses less digits than its factorization.

28406844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7106 (or 7101 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28406844 is about 5329.8071259662. The cubic root of 28406844 is about 305.1225665234.

The spelling of 28406844 in words is "twenty-eight million, four hundred six thousand, eight hundred forty-four".