27978577047 has 6 divisors (see below), whose sum is σ = 40413500192. Its totient is φ = 18652384692.

The previous prime is 27978576991. The next prime is 27978577049. The reversal of 27978577047 is 74077587972.

It is not a de Polignac number, because 27978577047 - 2⁷ = 27978576919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978577049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1554365383 + ... + 1554365400.

Almost surely, 2^27978577047 is an apocalyptic number.

27978577047 is a deficient number, since it is larger than the sum of its proper divisors (12434923145).

27978577047 is a wasteful number, since it uses less digits than its factorization.

27978577047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108730789 (or 3108730786 counting only the distinct ones).

The product of its (nonzero) digits is 48404160, while the sum is 63.

The spelling of 27978577047 in words is "twenty-seven billion, nine hundred seventy-eight million, five hundred seventy-seven thousand, forty-seven".