27145840 has 20 divisors (see below), whose sum is σ = 63114264. Its totient is φ = 10858304.

The previous prime is 27145829. The next prime is 27145843. The reversal of 27145840 is 4854172.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27145843) by changing a digit.

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, 169582 + ... + 169741.

Almost surely, 2^27145840 is an apocalyptic number.

27145840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27145840 is an abundant number, since it is smaller than the sum of its proper divisors (35968424).

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

27145840 is a wasteful number, since it uses less digits than its factorization.

27145840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339336 (or 339330 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 27145840 is about 5210.1669838883. The cubic root of 27145840 is about 300.5391785227.

The spelling of 27145840 in words is "twenty-seven million, one hundred forty-five thousand, eight hundred forty".