27981499 has 36 divisors (see below), whose sum is σ = 36717120. Its totient is φ = 21228480.

The previous prime is 27981487. The next prime is 27981521. The reversal of 27981499 is 99418972.

It is not a de Polignac number, because 27981499 - 2⁵ = 27981467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27981419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 256657 + ... + 256765.

It is an arithmetic number, because the mean of its divisors is an integer number (1019920).

Almost surely, 2^27981499 is an apocalyptic number.

27981499 is a deficient number, since it is larger than the sum of its proper divisors (8735621).

27981499 is a wasteful number, since it uses less digits than its factorization.

27981499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 160 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 27981499 is about 5289.7541530774. The cubic root of 27981499 is about 303.5920015795.

The spelling of 27981499 in words is "twenty-seven million, nine hundred eighty-one thousand, four hundred ninety-nine".