27220781952 has 384 divisors, whose sum is σ = 97755053760. Its totient is φ = 7078772736.

The previous prime is 27220781923. The next prime is 27220782013. The reversal of 27220781952 is 25918702272.

It is a tau number, because it is divible by the number of its divisors (384).

It is a junction number, because it is equal to n+sod(n) for n = 27220781898 and 27220781907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7650958 + ... + 7654514.

Almost surely, 2^27220781952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27220781952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48877526880).

27220781952 is an abundant number, since it is smaller than the sum of its proper divisors (70534271808).

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

27220781952 is a wasteful number, since it uses less digits than its factorization.

27220781952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670 (or 3655 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 27220781952 in words is "twenty-seven billion, two hundred twenty million, seven hundred eighty-one thousand, nine hundred fifty-two".