27909481 has 4 divisors (see below), whose sum is σ = 28094464. Its totient is φ = 27724500.

The previous prime is 27909467. The next prime is 27909491. The reversal of 27909481 is 18490972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27909481 - 2¹¹ = 27907433 is a prime.

It is a super-2 number, since 2×27909481² = 1557878259378722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27909491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92265 + ... + 92566.

It is an arithmetic number, because the mean of its divisors is an integer number (7023616).

Almost surely, 2^27909481 is an apocalyptic number.

It is an amenable number.

27909481 is a deficient number, since it is larger than the sum of its proper divisors (184983).

27909481 is a wasteful number, since it uses less digits than its factorization.

27909481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184982.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 27909481 is about 5282.9424566240. The cubic root of 27909481 is about 303.3313189363.

The spelling of 27909481 in words is "twenty-seven million, nine hundred nine thousand, four hundred eighty-one".