27989540 has 12 divisors (see below), whose sum is σ = 58778076. Its totient is φ = 11195808.

The previous prime is 27989537. The next prime is 27989543. The reversal of 27989540 is 4598972.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27989537) and next prime (27989543).

It can be written as a sum of positive squares in 2 ways, for example, as 2849344 + 25140196 = 1688^2 + 5014^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27989491 and 27989500.

It is not an unprimeable number, because it can be changed into a prime (27989543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699719 + ... + 699758.

It is an arithmetic number, because the mean of its divisors is an integer number (4898173).

Almost surely, 2^27989540 is an apocalyptic number.

27989540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27989540 is an abundant number, since it is smaller than the sum of its proper divisors (30788536).

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

27989540 is a wasteful number, since it uses less digits than its factorization.

27989540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399486 (or 1399484 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 27989540 is about 5290.5141527077. The cubic root of 27989540 is about 303.6210797153.

The spelling of 27989540 in words is "twenty-seven million, nine hundred eighty-nine thousand, five hundred forty".