28200191165 has 16 divisors (see below), whose sum is σ = 35032878000. Its totient is φ = 21766198272.

The previous prime is 28200191111. The next prime is 28200191177. The reversal of 28200191165 is 56119100282.

It can be written as a sum of positive squares in 8 ways, for example, as 8664258724 + 19535932441 = 93082^2 + 139771^2 .

It is a cyclic number.

It is not a de Polignac number, because 28200191165 - 2¹² = 28200187069 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128261 + ... + 269909.

It is an arithmetic number, because the mean of its divisors is an integer number (2189554875).

Almost surely, 2^28200191165 is an apocalyptic number.

It is an amenable number.

28200191165 is a deficient number, since it is larger than the sum of its proper divisors (6832686835).

28200191165 is a wasteful number, since it uses less digits than its factorization.

28200191165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143056.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 28200191165 in words is "twenty-eight billion, two hundred million, one hundred ninety-one thousand, one hundred sixty-five".