27861121542 has 48 divisors (see below), whose sum is σ = 58909012992. Its totient is φ = 8783339760.

The previous prime is 27861121531. The next prime is 27861121543. The reversal of 27861121542 is 24512116872.

It is a self number, because there is not a number n which added to its sum of digits gives 27861121542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27861121543) by changing a digit.

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, 1304167 + ... + 1325357.

It is an arithmetic number, because the mean of its divisors is an integer number (1227271104).

Almost surely, 2^27861121542 is an apocalyptic number.

27861121542 is an abundant number, since it is smaller than the sum of its proper divisors (31047891450).

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

27861121542 is a wasteful number, since it uses less digits than its factorization.

27861121542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21841 (or 21822 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The spelling of 27861121542 in words is "twenty-seven billion, eight hundred sixty-one million, one hundred twenty-one thousand, five hundred forty-two".