27681619 has 12 divisors (see below), whose sum is σ = 32304864. Its totient is φ = 23650704.

The previous prime is 27681571. The next prime is 27681671. The reversal of 27681619 is 91618672.

It is a de Polignac number, because none of the positive numbers 2^k-27681619 is a prime.

It is a super-2 number, since 2×27681619² = 1532544060922322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27631619) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 18742 + ... + 20164.

It is an arithmetic number, because the mean of its divisors is an integer number (2692072).

Almost surely, 2^27681619 is an apocalyptic number.

27681619 is a deficient number, since it is larger than the sum of its proper divisors (4623245).

27681619 is a wasteful number, since it uses less digits than its factorization.

27681619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834 (or 1827 counting only the distinct ones).

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

The square root of 27681619 is about 5261.3324357999. The cubic root of 27681619 is about 302.5035639222.

The spelling of 27681619 in words is "twenty-seven million, six hundred eighty-one thousand, six hundred nineteen".