27219663640 has 128 divisors (see below), whose sum is σ = 66665592000. Its totient is φ = 9942755328.

The previous prime is 27219663617. The next prime is 27219663641. The reversal of 27219663640 is 4636691272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27219663641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21314682 + ... + 21315958.

Almost surely, 2^27219663640 is an apocalyptic number.

27219663640 is a gapful number since it is divisible by the number (20) 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 27219663640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33332796000).

27219663640 is an abundant number, since it is smaller than the sum of its proper divisors (39445928360).

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

27219663640 is a wasteful number, since it uses less digits than its factorization.

27219663640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709 (or 1705 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 27219663640 in words is "twenty-seven billion, two hundred nineteen million, six hundred sixty-three thousand, six hundred forty".