27997540 has 24 divisors (see below), whose sum is σ = 59061240. Its totient is φ = 11148288.

The previous prime is 27997523. The next prime is 27997559. The reversal of 27997540 is 4579972.

It can be written as a sum of positive squares in 4 ways, for example, as 9144576 + 18852964 = 3024^2 + 4342^2 .

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 7 ways as a sum of consecutive naturals, for example, 1524 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (2460885).

Almost surely, 2^27997540 is an apocalyptic number.

27997540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27997540 is an abundant number, since it is smaller than the sum of its proper divisors (31063700).

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

27997540 is a wasteful number, since it uses less digits than its factorization.

27997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6351 (or 6349 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 27997540 is about 5291.2701688725. The cubic root of 27997540 is about 303.6500040594.

The spelling of 27997540 in words is "twenty-seven million, nine hundred ninety-seven thousand, five hundred forty".