27747315640 has 32 divisors (see below), whose sum is σ = 68107048560. Its totient is φ = 10089932800.

The previous prime is 27747315637. The next prime is 27747315641. The reversal of 27747315640 is 4651374772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27747315641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31530601 + ... + 31531480.

Almost surely, 2^27747315640 is an apocalyptic number.

27747315640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27747315640 is an abundant number, since it is smaller than the sum of its proper divisors (40359732920).

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

27747315640 is a wasteful number, since it uses less digits than its factorization.

27747315640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63062103 (or 63062099 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 27747315640 in words is "twenty-seven billion, seven hundred forty-seven million, three hundred fifteen thousand, six hundred forty".