27731486388 has 24 divisors (see below), whose sum is σ = 64794382240. Its totient is φ = 9231317280.

The previous prime is 27731486381. The next prime is 27731486399. The reversal of 27731486388 is 88368413772.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27731486381) 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, 1554703 + ... + 1572438.

Almost surely, 2^27731486388 is an apocalyptic number.

It is an amenable number.

27731486388 is an abundant number, since it is smaller than the sum of its proper divisors (37062895852).

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

27731486388 is a wasteful number, since it uses less digits than its factorization.

27731486388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127887 (or 3127885 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 57.

The spelling of 27731486388 in words is "twenty-seven billion, seven hundred thirty-one million, four hundred eighty-six thousand, three hundred eighty-eight".