27778787487 has 32 divisors (see below), whose sum is σ = 46846978560. Its totient is φ = 16103640960.

The previous prime is 27778787483. The next prime is 27778787527. The reversal of 27778787487 is 78478787772.

27778787487 is a `hidden beast` number, since 2 + 7 + 7 + 78 + 78 + 7 + 487 = 666.

It is not a de Polignac number, because 27778787487 - 2² = 27778787483 is a prime.

It is a super-2 number, since 2×27778787487² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27778787483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2026458 + ... + 2040119.

It is an arithmetic number, because the mean of its divisors is an integer number (1463968080).

Almost surely, 2^27778787487 is an apocalyptic number.

27778787487 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

27778787487 is a deficient number, since it is larger than the sum of its proper divisors (19068191073).

27778787487 is a wasteful number, since it uses less digits than its factorization.

27778787487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066620 (or 4066614 counting only the distinct ones).

The product of its digits is 481890304, while the sum is 72.

The spelling of 27778787487 in words is "twenty-seven billion, seven hundred seventy-eight million, seven hundred eighty-seven thousand, four hundred eighty-seven".