27750012640 has 96 divisors (see below), whose sum is σ = 76153500864. Its totient is φ = 9358295040.

The previous prime is 27750012571. The next prime is 27750012643. The reversal of 27750012640 is 4621005772.

It is a junction number, because it is equal to n+sod(n) for n = 27750012596 and 27750012605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27750012643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134769 + ... + 271408.

It is an arithmetic number, because the mean of its divisors is an integer number (793265634).

Almost surely, 2^27750012640 is an apocalyptic number.

27750012640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27750012640 is an abundant number, since it is smaller than the sum of its proper divisors (48403488224).

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

27750012640 is a wasteful number, since it uses less digits than its factorization.

27750012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406260 (or 406252 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 27750012640 in words is "twenty-seven billion, seven hundred fifty million, twelve thousand, six hundred forty".