28666627597 has 4 divisors (see below), whose sum is σ = 28667668540. Its totient is φ = 28665586656.

The previous prime is 28666627573. The next prime is 28666627631. The reversal of 28666627597 is 79572666682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16103356201 + 12563271396 = 126899^2 + 112086^2 .

It is a cyclic number.

It is not a de Polignac number, because 28666627597 - 2⁷ = 28666627469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666627567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478008 + ... + 534625.

It is an arithmetic number, because the mean of its divisors is an integer number (7166917135).

Almost surely, 2^28666627597 is an apocalyptic number.

It is an amenable number.

28666627597 is a deficient number, since it is larger than the sum of its proper divisors (1040943).

28666627597 is a wasteful number, since it uses less digits than its factorization.

28666627597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040942.

The product of its digits is 91445760, while the sum is 64.

The spelling of 28666627597 in words is "twenty-eight billion, six hundred sixty-six million, six hundred twenty-seven thousand, five hundred ninety-seven".