27297791388 has 72 divisors (see below), whose sum is σ = 78884289120. Its totient is φ = 7796995200.

The previous prime is 27297791371. The next prime is 27297791413. The reversal of 27297791388 is 88319779272.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 918018 + ... + 947286.

Almost surely, 2^27297791388 is an apocalyptic number.

27297791388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

27297791388 is an abundant number, since it is smaller than the sum of its proper divisors (51586497732).

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

27297791388 is a wasteful number, since it uses less digits than its factorization.

27297791388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32987 (or 32982 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 27297791388 in words is "twenty-seven billion, two hundred ninety-seven million, seven hundred ninety-one thousand, three hundred eighty-eight".