28020939 has 8 divisors (see below), whose sum is σ = 37402320. Its totient is φ = 18660096.

The previous prime is 28020911. The next prime is 28020961. The reversal of 28020939 is 93902082.

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

It is not a de Polignac number, because 28020939 - 2¹² = 28016843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28024939) 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, 1602 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (4675290).

Almost surely, 2^28020939 is an apocalyptic number.

28020939 is a deficient number, since it is larger than the sum of its proper divisors (9381381).

28020939 is a wasteful number, since it uses less digits than its factorization.

28020939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10269.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 28020939 is about 5293.4808018921. The cubic root of 28020939 is about 303.7345725369.

The spelling of 28020939 in words is "twenty-eight million, twenty thousand, nine hundred thirty-nine".