27781401847940 has 48 divisors (see below), whose sum is σ = 63089408973360. Its totient is φ = 10215185080320.

The previous prime is 27781401847897. The next prime is 27781401847981. The reversal of 27781401847940 is 4974810418772.

It can be written as a sum of positive squares in 8 ways, for example, as 28081715776 + 27753320132164 = 167576^2 + 5268142^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221621045 + ... + 221746364.

It is an arithmetic number, because the mean of its divisors is an integer number (1314362686945).

Almost surely, 2^{27781401847940} is an apocalyptic number.

27781401847940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27781401847940 is an abundant number, since it is smaller than the sum of its proper divisors (35308007125420).

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

27781401847940 is a wasteful number, since it uses less digits than its factorization.

27781401847940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443367672 (or 443367670 counting only the distinct ones).

The product of its (nonzero) digits is 25288704, while the sum is 62.

The spelling of 27781401847940 in words is "twenty-seven trillion, seven hundred eighty-one billion, four hundred one million, eight hundred forty-seven thousand, nine hundred forty".