28973389 has 8 divisors (see below), whose sum is σ = 30752568. Its totient is φ = 27202560.

The previous prime is 28973383. The next prime is 28973393. The reversal of 28973389 is 98337982.

It can be written as a sum of positive squares in 4 ways, for example, as 1232100 + 27741289 = 1110^2 + 5267^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28973389 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 (28973383) 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 7 ways as a sum of consecutive naturals, for example, 5989 + ... + 9685.

It is an arithmetic number, because the mean of its divisors is an integer number (3844071).

Almost surely, 2^28973389 is an apocalyptic number.

It is an amenable number.

28973389 is a deficient number, since it is larger than the sum of its proper divisors (1779179).

28973389 is a wasteful number, since it uses less digits than its factorization.

28973389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175.

The product of its digits is 653184, while the sum is 49.

The square root of 28973389 is about 5382.6934707449. The cubic root of 28973389 is about 307.1376797603.

The spelling of 28973389 in words is "twenty-eight million, nine hundred seventy-three thousand, three hundred eighty-nine".