27775401640 has 64 divisors (see below), whose sum is σ = 72428463360. Its totient is φ = 9388861440.

The previous prime is 27775401637. The next prime is 27775401649. The reversal of 27775401640 is 4610457772.

It is not an unprimeable number, because it can be changed into a prime (27775401649) 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, 678697 + ... + 718456.

It is an arithmetic number, because the mean of its divisors is an integer number (1131694740).

Almost surely, 2^27775401640 is an apocalyptic number.

27775401640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27775401640 is an abundant number, since it is smaller than the sum of its proper divisors (44653061720).

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

27775401640 is a wasteful number, since it uses less digits than its factorization.

27775401640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397242 (or 1397238 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 43.

The spelling of 27775401640 in words is "twenty-seven billion, seven hundred seventy-five million, four hundred one thousand, six hundred forty".