28666705 has 8 divisors (see below), whose sum is σ = 34449192. Its totient is φ = 22900608.

The previous prime is 28666643. The next prime is 28666721. The reversal of 28666705 is 50766682.

It can be written as a sum of positive squares in 4 ways, for example, as 1449616 + 27217089 = 1204^2 + 5217^2 .

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 28666705 - 2²¹ = 26569553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (4306149).

Almost surely, 2^28666705 is an apocalyptic number.

It is an amenable number.

28666705 is a deficient number, since it is larger than the sum of its proper divisors (5782487).

28666705 is an equidigital number, since it uses as much as digits as its factorization.

28666705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8195.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 28666705 is about 5354.1297145288. The cubic root of 28666705 is about 306.0501469925.

The spelling of 28666705 in words is "twenty-eight million, six hundred sixty-six thousand, seven hundred five".