27821641 has 2 divisors, whose sum is σ = 27821642. Its totient is φ = 27821640.

The previous prime is 27821623. The next prime is 27821653. The reversal of 27821641 is 14612872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23242041 + 4579600 = 4821^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 27821641 - 2⁵ = 27821609 is a prime.

It is not a weakly prime, because it can be changed into another prime (27821611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13910820 + 13910821.

It is an arithmetic number, because the mean of its divisors is an integer number (13910821).

Almost surely, 2^27821641 is an apocalyptic number.

It is an amenable number.

27821641 is a deficient number, since it is larger than the sum of its proper divisors (1).

27821641 is an equidigital number, since it uses as much as digits as its factorization.

27821641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 27821641 is about 5274.6223561502. The cubic root of 27821641 is about 303.0127578344.

The spelling of 27821641 in words is "twenty-seven million, eight hundred twenty-one thousand, six hundred forty-one".