28338989831 has 2 divisors, whose sum is σ = 28338989832. Its totient is φ = 28338989830.

The previous prime is 28338989719. The next prime is 28338989869. The reversal of 28338989831 is 13898983382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28338989831 - 2²² = 28334795527 is a prime.

It is a super-2 number, since 2×28338989831² (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 (28338989891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14169494915 + 14169494916.

It is an arithmetic number, because the mean of its divisors is an integer number (14169494916).

Almost surely, 2^28338989831 is an apocalyptic number.

28338989831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28338989831 is an equidigital number, since it uses as much as digits as its factorization.

28338989831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 62.

The spelling of 28338989831 in words is "twenty-eight billion, three hundred thirty-eight million, nine hundred eighty-nine thousand, eight hundred thirty-one".