27728572757 has 2 divisors, whose sum is σ = 27728572758. Its totient is φ = 27728572756.

The previous prime is 27728572723. The next prime is 27728572771. The reversal of 27728572757 is 75727582772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27171895921 + 556676836 = 164839^2 + 23594^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728572757 - 2⁶ = 27728572693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27728572696 and 27728572705.

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, 13864286378 + 13864286379.

It is an arithmetic number, because the mean of its divisors is an integer number (13864286379).

Almost surely, 2^27728572757 is an apocalyptic number.

It is an amenable number.

27728572757 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728572757 is an equidigital number, since it uses as much as digits as its factorization.

27728572757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26891200, while the sum is 59.

The spelling of 27728572757 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred seventy-two thousand, seven hundred fifty-seven".