27391640 has 16 divisors (see below), whose sum is σ = 61631280. Its totient is φ = 10956640.

The previous prime is 27391627. The next prime is 27391657. The reversal of 27391640 is 4619372.

It is a junction number, because it is equal to n+sod(n) for n = 27391597 and 27391606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342356 + ... + 342435.

It is an arithmetic number, because the mean of its divisors is an integer number (3851955).

Almost surely, 2^27391640 is an apocalyptic number.

27391640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27391640 is an abundant number, since it is smaller than the sum of its proper divisors (34239640).

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

27391640 is a wasteful number, since it uses less digits than its factorization.

27391640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684802 (or 684798 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 27391640 is about 5233.7023224482. The cubic root of 27391640 is about 301.4435611478.

The spelling of 27391640 in words is "twenty-seven million, three hundred ninety-one thousand, six hundred forty".