27171378640 has 80 divisors (see below), whose sum is σ = 75998171520. Its totient is φ = 8825587200.

The previous prime is 27171378623. The next prime is 27171378643. The reversal of 27171378640 is 4687317172.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27171378643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266211 + ... + 1287490.

It is an arithmetic number, because the mean of its divisors is an integer number (949977144).

Almost surely, 2^27171378640 is an apocalyptic number.

27171378640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27171378640 is an abundant number, since it is smaller than the sum of its proper divisors (48826792880).

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

27171378640 is a wasteful number, since it uses less digits than its factorization.

27171378640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553740 (or 2553734 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 27171378640 in words is "twenty-seven billion, one hundred seventy-one million, three hundred seventy-eight thousand, six hundred forty".