28020938 has 24 divisors (see below), whose sum is σ = 46754820. Its totient is φ = 12584000.

The previous prime is 28020911. The next prime is 28020961. The reversal of 28020938 is 83902082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 7382089 = 4543^2 + 2717^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20888 + ... + 22188.

Almost surely, 2^28020938 is an apocalyptic number.

28020938 is a deficient number, since it is larger than the sum of its proper divisors (18733882).

28020938 is a wasteful number, since it uses less digits than its factorization.

28020938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1403 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28020938 is about 5293.4807074363. The cubic root of 28020938 is about 303.7345689237.

The spelling of 28020938 in words is "twenty-eight million, twenty thousand, nine hundred thirty-eight".