28863738 has 12 divisors (see below), whose sum is σ = 62538138. Its totient is φ = 9621240.

The previous prime is 28863733. The next prime is 28863743. The reversal of 28863738 is 83736882.

28863738 is a `hidden beast` number, since 2 + 8 + 8 + 637 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (28863733) and next prime (28863743).

It can be written as a sum of positive squares in only one way, i.e., 28804689 + 59049 = 5367^2 + 243^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28863693 and 28863702.

It is not an unprimeable number, because it can be changed into a prime (28863733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 801753 + ... + 801788.

Almost surely, 2^28863738 is an apocalyptic number.

28863738 is an abundant number, since it is smaller than the sum of its proper divisors (33674400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28863738 is a wasteful number, since it uses less digits than its factorization.

28863738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603549 (or 1603546 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28863738 is about 5372.4983015353. The cubic root of 28863738 is about 306.7497314895.

The spelling of 28863738 in words is "twenty-eight million, eight hundred sixty-three thousand, seven hundred thirty-eight".