28668747 has 8 divisors (see below), whose sum is σ = 39258256. Its totient is φ = 18595872.

The previous prime is 28668743. The next prime is 28668751. The reversal of 28668747 is 74786682.

It is an interprime number because it is at equal distance from previous prime (28668743) and next prime (28668751).

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

It is not a de Polignac number, because 28668747 - 2² = 28668743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28668696 and 28668705.

It is not an unprimeable number, because it can be changed into a prime (28668743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129028 + ... + 129249.

It is an arithmetic number, because the mean of its divisors is an integer number (4907282).

Almost surely, 2^28668747 is an apocalyptic number.

28668747 is a deficient number, since it is larger than the sum of its proper divisors (10589509).

28668747 is a wasteful number, since it uses less digits than its factorization.

28668747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258317.

The product of its digits is 903168, while the sum is 48.

The square root of 28668747 is about 5354.3204050561. The cubic root of 28668747 is about 306.0574137218.

The spelling of 28668747 in words is "twenty-eight million, six hundred sixty-eight thousand, seven hundred forty-seven".