27721404 has 18 divisors (see below), whose sum is σ = 70073640. Its totient is φ = 9240456.

The previous prime is 27721387. The next prime is 27721427. The reversal of 27721404 is 40412772.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 384984 + ... + 385055.

It is an arithmetic number, because the mean of its divisors is an integer number (3892980).

Almost surely, 2^27721404 is an apocalyptic number.

It is an amenable number.

27721404 is an abundant number, since it is smaller than the sum of its proper divisors (42352236).

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

27721404 is a wasteful number, since it uses less digits than its factorization.

27721404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770049 (or 770044 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 27721404 is about 5265.1119646215. Note that the first 3 decimals coincide. The cubic root of 27721404 is about 302.6484174817.

The spelling of 27721404 in words is "twenty-seven million, seven hundred twenty-one thousand, four hundred four".