27748421 has 2 divisors, whose sum is σ = 27748422. Its totient is φ = 27748420.

The previous prime is 27748397. The next prime is 27748429. The reversal of 27748421 is 12484772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 2608225 = 5014^2 + 1615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27748421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27748429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13874210 + 13874211.

It is an arithmetic number, because the mean of its divisors is an integer number (13874211).

Almost surely, 2^27748421 is an apocalyptic number.

It is an amenable number.

27748421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27748421 is an equidigital number, since it uses as much as digits as its factorization.

27748421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 35.

The square root of 27748421 is about 5267.6770022468. The cubic root of 27748421 is about 302.7467049210.

The spelling of 27748421 in words is "twenty-seven million, seven hundred forty-eight thousand, four hundred twenty-one".