27728572957 has 2 divisors, whose sum is σ = 27728572958. Its totient is φ = 27728572956.

The previous prime is 27728572943. The next prime is 27728573003. The reversal of 27728572957 is 75927582772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14772214681 + 12956358276 = 121541^2 + 113826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27728572957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27728572895 and 27728572904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728572357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864286478 + 13864286479.

It is an arithmetic number, because the mean of its divisors is an integer number (13864286479).

Almost surely, 2^27728572957 is an apocalyptic number.

It is an amenable number.

27728572957 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728572957 is an equidigital number, since it uses as much as digits as its factorization.

27728572957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34574400, while the sum is 61.

The spelling of 27728572957 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred seventy-two thousand, nine hundred fifty-seven".