28665713 has 8 divisors (see below), whose sum is σ = 29846568. Its totient is φ = 27506304.

The previous prime is 28665701. The next prime is 28665733. The reversal of 28665713 is 31756682.

It can be written as a sum of positive squares in 4 ways, for example, as 21003889 + 7661824 = 4583^2 + 2768^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28665713 - 2⁴ = 28665697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28665733) 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, 2606 + ... + 8007.

It is an arithmetic number, because the mean of its divisors is an integer number (3730821).

Almost surely, 2^28665713 is an apocalyptic number.

It is an amenable number.

28665713 is a deficient number, since it is larger than the sum of its proper divisors (1180855).

28665713 is a wasteful number, since it uses less digits than its factorization.

28665713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10723.

The product of its digits is 60480, while the sum is 38.

The square root of 28665713 is about 5354.0370749557. The cubic root of 28665713 is about 306.0466167036.

The spelling of 28665713 in words is "twenty-eight million, six hundred sixty-five thousand, seven hundred thirteen".