27681402 has 64 divisors (see below), whose sum is σ = 66539520. Its totient is φ = 7511616.

The previous prime is 27681361. The next prime is 27681421. The reversal of 27681402 is 20418672.

It is a self number, because there is not a number n which added to its sum of digits gives 27681402.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 72849 + ... + 73227.

It is an arithmetic number, because the mean of its divisors is an integer number (1039680).

Almost surely, 2^27681402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27681402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33269760).

27681402 is an abundant number, since it is smaller than the sum of its proper divisors (38858118).

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

27681402 is a wasteful number, since it uses less digits than its factorization.

27681402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 27681402 is about 5261.3118136069. The cubic root of 27681402 is about 302.5027734645.

The spelling of 27681402 in words is "twenty-seven million, six hundred eighty-one thousand, four hundred two".