28687683 has 4 divisors (see below), whose sum is σ = 38250248. Its totient is φ = 19125120.

The previous prime is 28687667. The next prime is 28687697. The reversal of 28687683 is 38678682.

It is a happy number.

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

It is not a de Polignac number, because 28687683 - 2⁴ = 28687667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28687643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4781278 + ... + 4781283.

It is an arithmetic number, because the mean of its divisors is an integer number (9562562).

Almost surely, 2^28687683 is an apocalyptic number.

28687683 is a deficient number, since it is larger than the sum of its proper divisors (9562565).

28687683 is an equidigital number, since it uses as much as digits as its factorization.

28687683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9562564.

The product of its digits is 774144, while the sum is 48.

The square root of 28687683 is about 5356.0884047969. The cubic root of 28687683 is about 306.1247835730.

Subtracting 28687683 from its reverse (38678682), we obtain a palindrome (9990999).

The spelling of 28687683 in words is "twenty-eight million, six hundred eighty-seven thousand, six hundred eighty-three".