28863938 has 4 divisors (see below), whose sum is σ = 43295910. Its totient is φ = 14431968.

The previous prime is 28863937. The next prime is 28863941. The reversal of 28863938 is 83936882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28590409 + 273529 = 5347^2 + 523^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28863892 and 28863901.

It is not an unprimeable number, because it can be changed into a prime (28863937) 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 as a sum of consecutive naturals, namely, 7215983 + ... + 7215986.

Almost surely, 2^28863938 is an apocalyptic number.

28863938 is a deficient number, since it is larger than the sum of its proper divisors (14431972).

28863938 is a wasteful number, since it uses less digits than its factorization.

28863938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431971.

The product of its digits is 497664, while the sum is 47.

The square root of 28863938 is about 5372.5169148175. The cubic root of 28863938 is about 306.7504399887.

The spelling of 28863938 in words is "twenty-eight million, eight hundred sixty-three thousand, nine hundred thirty-eight".