28920044 has 12 divisors (see below), whose sum is σ = 50715000. Its totient is φ = 14430048.

The previous prime is 28920041. The next prime is 28920049. The reversal of 28920044 is 44002982.

It is a junction number, because it is equal to n+sod(n) for n = 28919989 and 28920016.

It is not an unprimeable number, because it can be changed into a prime (28920041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5249 + ... + 9240.

It is an arithmetic number, because the mean of its divisors is an integer number (4226250).

Almost surely, 2^28920044 is an apocalyptic number.

It is an amenable number.

28920044 is a deficient number, since it is larger than the sum of its proper divisors (21794956).

28920044 is a wasteful number, since it uses less digits than its factorization.

28920044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14992 (or 14990 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28920044 is about 5377.7359548420. The cubic root of 28920044 is about 306.9490661645.

The spelling of 28920044 in words is "twenty-eight million, nine hundred twenty thousand, forty-four".