27720361 has 2 divisors, whose sum is σ = 27720362. Its totient is φ = 27720360.

The previous prime is 27720347. The next prime is 27720367. The reversal of 27720361 is 16302772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19053225 + 8667136 = 4365^2 + 2944^2 .

It is a cyclic number.

It is not a de Polignac number, because 27720361 - 2⁷ = 27720233 is a prime.

It is equal to p_1725094 and since 27720361 and 1725094 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (27720367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860180 + 13860181.

It is an arithmetic number, because the mean of its divisors is an integer number (13860181).

Almost surely, 2^27720361 is an apocalyptic number.

It is an amenable number.

27720361 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720361 is an equidigital number, since it uses as much as digits as its factorization.

27720361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 27720361 is about 5265.0129154637. The cubic root of 27720361 is about 302.6446217834.

The spelling of 27720361 in words is "twenty-seven million, seven hundred twenty thousand, three hundred sixty-one".