27887915025 has 18 divisors (see below), whose sum is σ = 49950354870. Its totient is φ = 14873554560.

The previous prime is 27887914997. The next prime is 27887915039. The reversal of 27887915025 is 52051978872.

It can be written as a sum of positive squares in 3 ways, for example, as 6429473856 + 21458441169 = 80184^2 + 146487^2 .

It is not a de Polignac number, because 27887915025 - 2⁹ = 27887914513 is a prime.

It is a Curzon 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 17 ways as a sum of consecutive naturals, for example, 61972920 + ... + 61973369.

It is an arithmetic number, because the mean of its divisors is an integer number (2775019715).

Almost surely, 2^27887915025 is an apocalyptic number.

27887915025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27887915025 is a deficient number, since it is larger than the sum of its proper divisors (22062439845).

27887915025 is a wasteful number, since it uses less digits than its factorization.

27887915025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123946305 (or 123946297 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 27887915025 in words is "twenty-seven billion, eight hundred eighty-seven million, nine hundred fifteen thousand, twenty-five".