27771621440 has 56 divisors (see below), whose sum is σ = 66145742232. Its totient is φ = 11106201600.

The previous prime is 27771621419. The next prime is 27771621457. The reversal of 27771621440 is 4412617772.

It can be written as a sum of positive squares in 4 ways, for example, as 9956846656 + 17814774784 = 99784^2 + 133472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2367590 + ... + 2379290.

Almost surely, 2^27771621440 is an apocalyptic number.

27771621440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27771621440 is an abundant number, since it is smaller than the sum of its proper divisors (38374120792).

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

27771621440 is a wasteful number, since it uses less digits than its factorization.

27771621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19135 (or 19125 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The spelling of 27771621440 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred twenty-one thousand, four hundred forty".