27727640 has 64 divisors (see below), whose sum is σ = 65664000. Its totient is φ = 10523520.

The previous prime is 27727621. The next prime is 27727643. The reversal of 27727640 is 4672772.

It is a self number, because there is not a number n which added to its sum of digits gives 27727640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27727643) 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, 72971 + ... + 73349.

It is an arithmetic number, because the mean of its divisors is an integer number (1026000).

Almost surely, 2^27727640 is an apocalyptic number.

27727640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27727640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32832000).

27727640 is an abundant number, since it is smaller than the sum of its proper divisors (37936360).

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

27727640 is a wasteful number, since it uses less digits than its factorization.

27727640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 35.

The square root of 27727640 is about 5265.7041314529. The cubic root of 27727640 is about 302.6711096227.

The spelling of 27727640 in words is "twenty-seven million, seven hundred twenty-seven thousand, six hundred forty".