27705640 has 16 divisors (see below), whose sum is σ = 62337780. Its totient is φ = 11082240.

The previous prime is 27705581. The next prime is 27705641. The reversal of 27705640 is 4650772.

It can be written as a sum of positive squares in 2 ways, for example, as 27604516 + 101124 = 5254^2 + 318^2 .

It is not an unprimeable number, because it can be changed into a prime (27705641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346281 + ... + 346360.

Almost surely, 2^27705640 is an apocalyptic number.

27705640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27705640 is an abundant number, since it is smaller than the sum of its proper divisors (34632140).

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

27705640 is a wasteful number, since it uses less digits than its factorization.

27705640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692652 (or 692648 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 27705640 is about 5263.6147275423. The cubic root of 27705640 is about 302.5910387827.

The spelling of 27705640 in words is "twenty-seven million, seven hundred five thousand, six hundred forty".