28128876731 has 2 divisors, whose sum is σ = 28128876732. Its totient is φ = 28128876730.

The previous prime is 28128876709. The next prime is 28128876761. The reversal of 28128876731 is 13767882182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28128876731 - 2¹⁸ = 28128614587 is a prime.

It is a super-2 number, since 2×28128876731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28128876761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064438365 + 14064438366.

It is an arithmetic number, because the mean of its divisors is an integer number (14064438366).

Almost surely, 2^28128876731 is an apocalyptic number.

28128876731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128876731 is an equidigital number, since it uses as much as digits as its factorization.

28128876731 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 28128876731 in words is "twenty-eight billion, one hundred twenty-eight million, eight hundred seventy-six thousand, seven hundred thirty-one".