27800864565 has 8 divisors (see below), whose sum is σ = 44481383328. Its totient is φ = 14827127760.

The previous prime is 27800864503. The next prime is 27800864599. The reversal of 27800864565 is 56546800872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27800864565 - 2⁶ = 27800864501 is a prime.

It is a super-2 number, since 2×27800864565² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926695471 + ... + 926695500.

It is an arithmetic number, because the mean of its divisors is an integer number (5560172916).

Almost surely, 2^27800864565 is an apocalyptic number.

It is an amenable number.

27800864565 is a deficient number, since it is larger than the sum of its proper divisors (16680518763).

27800864565 is a wasteful number, since it uses less digits than its factorization.

27800864565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853390979.

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 27800864565 in words is "twenty-seven billion, eight hundred million, eight hundred sixty-four thousand, five hundred sixty-five".