27579972987 has 32 divisors (see below), whose sum is σ = 46704537600. Its totient is φ = 15757187904.

The previous prime is 27579972983. The next prime is 27579973033. The reversal of 27579972987 is 78927997572.

It is a happy number.

27579972987 is a `hidden beast` number, since 27 + 579 + 9 + 7 + 29 + 8 + 7 = 666.

It is not a de Polignac number, because 27579972987 - 2² = 27579972983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27579972983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1557439 + ... + 1575047.

It is an arithmetic number, because the mean of its divisors is an integer number (1459516800).

Almost surely, 2^27579972987 is an apocalyptic number.

27579972987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

27579972987 is a deficient number, since it is larger than the sum of its proper divisors (19124564613).

27579972987 is a wasteful number, since it uses less digits than its factorization.

27579972987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25912 (or 25906 counting only the distinct ones).

The product of its digits is 280052640, while the sum is 72.

The spelling of 27579972987 in words is "twenty-seven billion, five hundred seventy-nine million, nine hundred seventy-two thousand, nine hundred eighty-seven".