27145640 has 16 divisors (see below), whose sum is σ = 61077780. Its totient is φ = 10858240.

The previous prime is 27145639. The next prime is 27145667. The reversal of 27145640 is 4654172.

It can be written as a sum of positive squares in 2 ways, for example, as 25786084 + 1359556 = 5078^2 + 1166^2 .

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, 339281 + ... + 339360.

Almost surely, 2^27145640 is an apocalyptic number.

27145640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27145640 is an abundant number, since it is smaller than the sum of its proper divisors (33932140).

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

27145640 is a wasteful number, since it uses less digits than its factorization.

27145640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678652 (or 678648 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 27145640 is about 5210.1477906102. The cubic root of 27145640 is about 300.5384404356.

The spelling of 27145640 in words is "twenty-seven million, one hundred forty-five thousand, six hundred forty".