28605775031 has 2 divisors, whose sum is σ = 28605775032. Its totient is φ = 28605775030.

The previous prime is 28605775019. The next prime is 28605775049. The reversal of 28605775031 is 13057750682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28605775031 - 2²² = 28601580727 is a prime.

It is a super-2 number, since 2×28605775031² (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 (28605775091) 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, 14302887515 + 14302887516.

It is an arithmetic number, because the mean of its divisors is an integer number (14302887516).

Almost surely, 2^28605775031 is an apocalyptic number.

28605775031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28605775031 is an equidigital number, since it uses as much as digits as its factorization.

28605775031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 28605775031 in words is "twenty-eight billion, six hundred five million, seven hundred seventy-five thousand, thirty-one".