27850721 has 2 divisors, whose sum is σ = 27850722. Its totient is φ = 27850720.

The previous prime is 27850663. The next prime is 27850727. The reversal of 27850721 is 12705872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 12327121 = 3940^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 27850721 - 2¹⁰ = 27849697 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (27850727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13925360 + 13925361.

It is an arithmetic number, because the mean of its divisors is an integer number (13925361).

Almost surely, 2^27850721 is an apocalyptic number.

It is an amenable number.

27850721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27850721 is an equidigital number, since it uses as much as digits as its factorization.

27850721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 27850721 is about 5277.3782316601. The cubic root of 27850721 is about 303.1182936979.

The spelling of 27850721 in words is "twenty-seven million, eight hundred fifty thousand, seven hundred twenty-one".