27721073 has 2 divisors, whose sum is σ = 27721074. Its totient is φ = 27721072.

The previous prime is 27721069. The next prime is 27721081. The reversal of 27721073 is 37012772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27699169 + 21904 = 5263^2 + 148^2 .

It is a cyclic number.

It is not a de Polignac number, because 27721073 - 2² = 27721069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27721063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860536 + 13860537.

It is an arithmetic number, because the mean of its divisors is an integer number (13860537).

Almost surely, 2^27721073 is an apocalyptic number.

It is an amenable number.

27721073 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721073 is an equidigital number, since it uses as much as digits as its factorization.

27721073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 27721073 is about 5265.0805311980. The cubic root of 27721073 is about 302.6472129128.

The spelling of 27721073 in words is "twenty-seven million, seven hundred twenty-one thousand, seventy-three".