28323701291 has 2 divisors, whose sum is σ = 28323701292. Its totient is φ = 28323701290.

The previous prime is 28323701267. The next prime is 28323701389. The reversal of 28323701291 is 19210732382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28323701291 - 2³⁴ = 11143832107 is a prime.

It is not a weakly prime, because it can be changed into another prime (28323701251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14161850645 + 14161850646.

It is an arithmetic number, because the mean of its divisors is an integer number (14161850646).

Almost surely, 2^28323701291 is an apocalyptic number.

28323701291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28323701291 is an equidigital number, since it uses as much as digits as its factorization.

28323701291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 28323701291 in words is "twenty-eight billion, three hundred twenty-three million, seven hundred one thousand, two hundred ninety-one".