27731607440 has 20 divisors (see below), whose sum is σ = 64475987484. Its totient is φ = 11092642944.

The previous prime is 27731607437. The next prime is 27731607451. The reversal of 27731607440 is 4470613772.

It can be written as a sum of positive squares in 2 ways, for example, as 4251561616 + 23480045824 = 65204^2 + 153232^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173322467 + ... + 173322626.

Almost surely, 2^27731607440 is an apocalyptic number.

27731607440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27731607440 is an abundant number, since it is smaller than the sum of its proper divisors (36744380044).

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

27731607440 is a wasteful number, since it uses less digits than its factorization.

27731607440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346645106 (or 346645100 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 41.

The spelling of 27731607440 in words is "twenty-seven billion, seven hundred thirty-one million, six hundred seven thousand, four hundred forty".