27021901968 has 100 divisors (see below), whose sum is σ = 79199514240. Its totient is φ = 8893250496.

The previous prime is 27021901957. The next prime is 27021901987. The reversal of 27021901968 is 86910912072.

27021901968 is a `hidden beast` number, since 270 + 2 + 190 + 196 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29580 + ... + 234347.

Almost surely, 2^27021901968 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 27021901968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39599757120).

27021901968 is an abundant number, since it is smaller than the sum of its proper divisors (52177612272).

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

27021901968 is a wasteful number, since it uses less digits than its factorization.

27021901968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264026 (or 264011 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 27021901968 in words is "twenty-seven billion, twenty-one million, nine hundred one thousand, nine hundred sixty-eight".