28687839 has 8 divisors (see below), whose sum is σ = 39284400. Its totient is φ = 18608256.

The previous prime is 28687817. The next prime is 28687843. The reversal of 28687839 is 93878682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28687839 - 2⁵ = 28687807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28687791 and 28687800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129114 + ... + 129335.

It is an arithmetic number, because the mean of its divisors is an integer number (4910550).

Almost surely, 2^28687839 is an apocalyptic number.

28687839 is a deficient number, since it is larger than the sum of its proper divisors (10596561).

28687839 is a wasteful number, since it uses less digits than its factorization.

28687839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258489.

The product of its digits is 1161216, while the sum is 51.

The square root of 28687839 is about 5356.1029676435. The cubic root of 28687839 is about 306.1253384613.

The spelling of 28687839 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred thirty-nine".