27989873778 has 16 divisors (see below), whose sum is σ = 57035969856. Its totient is φ = 9153920880.

The previous prime is 27989873773. The next prime is 27989873803. The reversal of 27989873778 is 87737898972.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (27989873773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44008918 + ... + 44009553.

It is an arithmetic number, because the mean of its divisors is an integer number (3564748116).

Almost surely, 2^27989873778 is an apocalyptic number.

27989873778 is an abundant number, since it is smaller than the sum of its proper divisors (29046096078).

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

27989873778 is a wasteful number, since it uses less digits than its factorization.

27989873778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88018529.

The product of its digits is 597445632, while the sum is 75.

The spelling of 27989873778 in words is "twenty-seven billion, nine hundred eighty-nine million, eight hundred seventy-three thousand, seven hundred seventy-eight".