28653939 has 16 divisors (see below), whose sum is σ = 42649600. Its totient is φ = 19012968.

The previous prime is 28653931. The next prime is 28653991. The reversal of 28653939 is 93935682.

28653939 is a `hidden beast` number, since 2 + 86 + 539 + 39 = 666.

It is not a de Polignac number, because 28653939 - 2³ = 28653931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28653894 and 28653903.

It is not an unprimeable number, because it can be changed into a prime (28653931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3642 + ... + 8400.

It is an arithmetic number, because the mean of its divisors is an integer number (2665600).

Almost surely, 2^28653939 is an apocalyptic number.

28653939 is a deficient number, since it is larger than the sum of its proper divisors (13995661).

28653939 is a wasteful number, since it uses less digits than its factorization.

28653939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991 (or 4985 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 28653939 is about 5352.9374179043. The cubic root of 28653939 is about 306.0047096545.

It can be divided in two parts, 28653 and 939, that added together give a palindrome (29592).

The spelling of 28653939 in words is "twenty-eight million, six hundred fifty-three thousand, nine hundred thirty-nine".