28188727631 has 2 divisors, whose sum is σ = 28188727632. Its totient is φ = 28188727630.

The previous prime is 28188727607. The next prime is 28188727657. The reversal of 28188727631 is 13672788182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28188727631 - 2¹⁴ = 28188711247 is a prime.

It is a super-2 number, since 2×28188727631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28188727691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094363815 + 14094363816.

It is an arithmetic number, because the mean of its divisors is an integer number (14094363816).

Almost surely, 2^28188727631 is an apocalyptic number.

28188727631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28188727631 is an equidigital number, since it uses as much as digits as its factorization.

28188727631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 53.

The spelling of 28188727631 in words is "twenty-eight billion, one hundred eighty-eight million, seven hundred twenty-seven thousand, six hundred thirty-one".