27781372830 has 24 divisors (see below), whose sum is σ = 66677485896. Its totient is φ = 7408122640.

The previous prime is 27781372763. The next prime is 27781372831. The reversal of 27781372830 is 3827318772.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 27781372830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27781372831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897715 + ... + 928145.

It is an arithmetic number, because the mean of its divisors is an integer number (2778228579).

Almost surely, 2^27781372830 is an apocalyptic number.

27781372830 is an abundant number, since it is smaller than the sum of its proper divisors (38896113066).

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

27781372830 is an frugal number, since it uses more digits than its factorization.

27781372830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60872 (or 30441 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 27781372830 in words is "twenty-seven billion, seven hundred eighty-one million, three hundred seventy-two thousand, eight hundred thirty".