27978749022 has 192 divisors, whose sum is σ = 74520103680. Its totient is φ = 6934201344.

The previous prime is 27978748999. The next prime is 27978749053. The reversal of 27978749022 is 22094787972.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3509613 + ... + 3517575.

It is an arithmetic number, because the mean of its divisors is an integer number (388125540).

Almost surely, 2^27978749022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27978749022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37260051840).

27978749022 is an abundant number, since it is smaller than the sum of its proper divisors (46541354658).

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

27978749022 is a wasteful number, since it uses less digits than its factorization.

27978749022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8055 (or 8048 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 57.

The spelling of 27978749022 in words is "twenty-seven billion, nine hundred seventy-eight million, seven hundred forty-nine thousand, twenty-two".