27628497991 has 2 divisors, whose sum is σ = 27628497992. Its totient is φ = 27628497990.

The previous prime is 27628497961. The next prime is 27628497997. The reversal of 27628497991 is 19979482672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27628497991 - 2⁵ = 27628497959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27628497997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13814248995 + 13814248996.

It is an arithmetic number, because the mean of its divisors is an integer number (13814248996).

Almost surely, 2^27628497991 is an apocalyptic number.

27628497991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27628497991 is an equidigital number, since it uses as much as digits as its factorization.

27628497991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 64.

The spelling of 27628497991 in words is "twenty-seven billion, six hundred twenty-eight million, four hundred ninety-seven thousand, nine hundred ninety-one".