27819774972 has 120 divisors (see below), whose sum is σ = 79404095232. Its totient is φ = 8423200800.

The previous prime is 27819774971. The next prime is 27819775003. The reversal of 27819774972 is 27947791872.

27819774972 is a `hidden beast` number, since 2 + 78 + 1 + 9 + 77 + 497 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27819774971) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5639347 + ... + 5644277.

Almost surely, 2^27819774972 is an apocalyptic number.

27819774972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27819774972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39702047616).

27819774972 is an abundant number, since it is smaller than the sum of its proper divisors (51584320260).

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

27819774972 is a wasteful number, since it uses less digits than its factorization.

27819774972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541 (or 6530 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 63.

The spelling of 27819774972 in words is "twenty-seven billion, eight hundred nineteen million, seven hundred seventy-four thousand, nine hundred seventy-two".