27978741 has 24 divisors (see below), whose sum is σ = 48197760. Its totient is φ = 15291936.

The previous prime is 27978733. The next prime is 27978749. The reversal of 27978741 is 14787972.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27978733) and next prime (27978749).

It is not a de Polignac number, because 27978741 - 2³ = 27978733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978749) 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 23 ways as a sum of consecutive naturals, for example, 8206 + ... + 11103.

It is an arithmetic number, because the mean of its divisors is an integer number (2008240).

Almost surely, 2^27978741 is an apocalyptic number.

27978741 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27978741 is a deficient number, since it is larger than the sum of its proper divisors (20219019).

27978741 is a wasteful number, since it uses less digits than its factorization.

27978741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19345 (or 19342 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 27978741 is about 5289.4934540086. The cubic root of 27978741 is about 303.5820267238.

The spelling of 27978741 in words is "twenty-seven million, nine hundred seventy-eight thousand, seven hundred forty-one".