27638891375 has 8 divisors (see below), whose sum is σ = 34493336592. Its totient is φ = 22111113000.

The previous prime is 27638891339. The next prime is 27638891419. The reversal of 27638891375 is 57319883672.

It is a happy number.

It is not a de Polignac number, because 27638891375 - 2¹⁸ = 27638629231 is a prime.

It is a Duffinian number.

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, 110555441 + ... + 110555690.

It is an arithmetic number, because the mean of its divisors is an integer number (4311667074).

Almost surely, 2^27638891375 is an apocalyptic number.

27638891375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27638891375 is a deficient number, since it is larger than the sum of its proper divisors (6854445217).

27638891375 is an equidigital number, since it uses as much as digits as its factorization.

27638891375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221111146 (or 221111136 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 59.

It can be divided in two parts, 276388 and 91375, that added together give a palindrome (367763).

The spelling of 27638891375 in words is "twenty-seven billion, six hundred thirty-eight million, eight hundred ninety-one thousand, three hundred seventy-five".