27697047840 has 576 divisors, whose sum is σ = 124049802240. Its totient is φ = 5451909120.

The previous prime is 27697047839. The next prime is 27697047881. The reversal of 27697047840 is 4874079672.

27697047840 is a `hidden beast` number, since 2 + 7 + 69 + 70 + 478 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2100147 + ... + 2113293.

It is an arithmetic number, because the mean of its divisors is an integer number (215364240).

Almost surely, 2^27697047840 is an apocalyptic number.

27697047840 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 27697047840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62024901120).

27697047840 is an abundant number, since it is smaller than the sum of its proper divisors (96352754400).

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

27697047840 is a wasteful number, since it uses less digits than its factorization.

27697047840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13205 (or 13194 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 27697047840 in words is "twenty-seven billion, six hundred ninety-seven million, forty-seven thousand, eight hundred forty".