27728778313 has 2 divisors, whose sum is σ = 27728778314. Its totient is φ = 27728778312.

The previous prime is 27728778293. The next prime is 27728778401. The reversal of 27728778313 is 31387782772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18521032464 + 9207745849 = 136092^2 + 95957^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728778313 - 2²¹ = 27726681161 is a prime.

It is not a weakly prime, because it can be changed into another prime (27728788313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864389156 + 13864389157.

It is an arithmetic number, because the mean of its divisors is an integer number (13864389157).

Almost surely, 2^27728778313 is an apocalyptic number.

It is an amenable number.

27728778313 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728778313 is an equidigital number, since it uses as much as digits as its factorization.

27728778313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5531904, while the sum is 55.

The spelling of 27728778313 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred seventy-eight thousand, three hundred thirteen".