27728630437 has 2 divisors, whose sum is σ = 27728630438. Its totient is φ = 27728630436.

The previous prime is 27728630429. The next prime is 27728630441. The reversal of 27728630437 is 73403682772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21974801121 + 5753829316 = 148239^2 + 75854^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728630437 - 2³ = 27728630429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728630407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864315218 + 13864315219.

It is an arithmetic number, because the mean of its divisors is an integer number (13864315219).

Almost surely, 2^27728630437 is an apocalyptic number.

It is an amenable number.

27728630437 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728630437 is an equidigital number, since it uses as much as digits as its factorization.

27728630437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 49.

The spelling of 27728630437 in words is "twenty-seven billion, seven hundred twenty-eight million, six hundred thirty thousand, four hundred thirty-seven".