27887471993 has 8 divisors (see below), whose sum is σ = 29654644968. Its totient is φ = 26134380544.

The previous prime is 27887471987. The next prime is 27887471999. The reversal of 27887471993 is 39917478872.

It is an interprime number because it is at equal distance from previous prime (27887471987) and next prime (27887471999).

It can be written as a sum of positive squares in 4 ways, for example, as 7823209 + 27879648784 = 2797^2 + 166972^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 27887471993 - 2¹² = 27887467897 is a prime.

It is a super-2 number, since 2×27887471993² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27887471999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3516296 + ... + 3524217.

It is an arithmetic number, because the mean of its divisors is an integer number (3706830621).

Almost surely, 2^27887471993 is an apocalyptic number.

It is an amenable number.

27887471993 is a deficient number, since it is larger than the sum of its proper divisors (1767172975).

27887471993 is a wasteful number, since it uses less digits than its factorization.

27887471993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040763.

The product of its digits is 42674688, while the sum is 65.

The spelling of 27887471993 in words is "twenty-seven billion, eight hundred eighty-seven million, four hundred seventy-one thousand, nine hundred ninety-three".