27661816 has 32 divisors (see below), whose sum is σ = 63836640. Its totient is φ = 10942848.

The previous prime is 27661793. The next prime is 27661819. The reversal of 27661816 is 61816672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27661819) 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 7 ways as a sum of consecutive naturals, for example, 18271 + ... + 19726.

It is an arithmetic number, because the mean of its divisors is an integer number (1994895).

Almost surely, 2^27661816 is an apocalyptic number.

27661816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

27661816 is an abundant number, since it is smaller than the sum of its proper divisors (36174824).

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

27661816 is a wasteful number, since it uses less digits than its factorization.

27661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38023 (or 38019 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 27661816 is about 5259.4501613762. The cubic root of 27661816 is about 302.4314112645.

The spelling of 27661816 in words is "twenty-seven million, six hundred sixty-one thousand, eight hundred sixteen".