27975977656 has 16 divisors (see below), whose sum is σ = 57223590840. Its totient is φ = 12716353440.

The previous prime is 27975977629. The next prime is 27975977657. The reversal of 27975977656 is 65677957972.

It is a super-2 number, since 2×27975977656² (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 (27975977657) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 158954331 + ... + 158954506.

Almost surely, 2^27975977656 is an apocalyptic number.

It is an amenable number.

27975977656 is an abundant number, since it is smaller than the sum of its proper divisors (29247613184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27975977656 is a wasteful number, since it uses less digits than its factorization.

27975977656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317908854 (or 317908850 counting only the distinct ones).

The product of its digits is 350065800, while the sum is 70.

The spelling of 27975977656 in words is "twenty-seven billion, nine hundred seventy-five million, nine hundred seventy-seven thousand, six hundred fifty-six".