27991817433492 has 48 divisors (see below), whose sum is σ = 71516775960000. Its totient is φ = 8450835938560.

The previous prime is 27991817433389. The next prime is 27991817433509. The reversal of 27991817433492 is 29433471819972.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394126617 + ... + 394197632.

It is an arithmetic number, because the mean of its divisors is an integer number (1489932832500).

Almost surely, 2^{27991817433492} is an apocalyptic number.

27991817433492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

27991817433492 is an abundant number, since it is smaller than the sum of its proper divisors (43524958526508).

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

27991817433492 is a wasteful number, since it uses less digits than its factorization.

27991817433492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788324536 (or 788324534 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 69.

The spelling of 27991817433492 in words is "twenty-seven trillion, nine hundred ninety-one billion, eight hundred seventeen million, four hundred thirty-three thousand, four hundred ninety-two".