27989177685 has 32 divisors (see below), whose sum is σ = 53873909760. Its totient is φ = 12121627968.

The previous prime is 27989177651. The next prime is 27989177759. The reversal of 27989177685 is 58677198972.

It is not a de Polignac number, because 27989177685 - 2¹¹ = 27989175637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7012837 + ... + 7016826.

It is an arithmetic number, because the mean of its divisors is an integer number (1683559680).

Almost surely, 2^27989177685 is an apocalyptic number.

It is an amenable number.

27989177685 is a deficient number, since it is larger than the sum of its proper divisors (25884732075).

27989177685 is a wasteful number, since it uses less digits than its factorization.

27989177685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14029697.

The product of its digits is 106686720, while the sum is 69.

The spelling of 27989177685 in words is "twenty-seven billion, nine hundred eighty-nine million, one hundred seventy-seven thousand, six hundred eighty-five".