27660491390 has 32 divisors (see below), whose sum is σ = 56947320000. Its totient is φ = 9475974144.

The previous prime is 27660491387. The next prime is 27660491407. The reversal of 27660491390 is 9319406672.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70757 + ... + 245616.

It is an arithmetic number, because the mean of its divisors is an integer number (1779603750).

Almost surely, 2^27660491390 is an apocalyptic number.

27660491390 is an abundant number, since it is smaller than the sum of its proper divisors (29286828610).

27660491390 is a wasteful number, since it uses less digits than its factorization.

27660491390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317636.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 27660491390 in words is "twenty-seven billion, six hundred sixty million, four hundred ninety-one thousand, three hundred ninety".