28665701 has 2 divisors, whose sum is σ = 28665702. Its totient is φ = 28665700.

The previous prime is 28665697. The next prime is 28665733. The reversal of 28665701 is 10756682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23512801 + 5152900 = 4849^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 28665701 - 2² = 28665697 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28665761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14332850 + 14332851.

It is an arithmetic number, because the mean of its divisors is an integer number (14332851).

Almost surely, 2^28665701 is an apocalyptic number.

It is an amenable number.

28665701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28665701 is an equidigital number, since it uses as much as digits as its factorization.

28665701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28665701 is about 5354.0359543059. The cubic root of 28665701 is about 306.0465739980.

The spelling of 28665701 in words is "twenty-eight million, six hundred sixty-five thousand, seven hundred one".