27640437829 has 2 divisors, whose sum is σ = 27640437830. Its totient is φ = 27640437828.

The previous prime is 27640437767. The next prime is 27640437871. The reversal of 27640437829 is 92873404672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27523473604 + 116964225 = 165902^2 + 10815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27640437829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27640437029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820218914 + 13820218915.

It is an arithmetic number, because the mean of its divisors is an integer number (13820218915).

Almost surely, 2^27640437829 is an apocalyptic number.

It is an amenable number.

27640437829 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640437829 is an equidigital number, since it uses as much as digits as its factorization.

27640437829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 27640437829 in words is "twenty-seven billion, six hundred forty million, four hundred thirty-seven thousand, eight hundred twenty-nine".