28665801 has 12 divisors (see below), whose sum is σ = 41787460. Its totient is φ = 18934560.

The previous prime is 28665781. The next prime is 28665809. The reversal of 28665801 is 10856682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8415801 + 20250000 = 2901^2 + 4500^2 .

It is not a de Polignac number, because 28665801 - 2⁷ = 28665673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28665809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13630 + ... + 15591.

Almost surely, 2^28665801 is an apocalyptic number.

It is an amenable number.

28665801 is a deficient number, since it is larger than the sum of its proper divisors (13121659).

28665801 is a wasteful number, since it uses less digits than its factorization.

28665801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29336 (or 29333 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28665801 is about 5354.0452930471. The cubic root of 28665801 is about 306.0469298777.

The spelling of 28665801 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred one".