28293311989 has 2 divisors, whose sum is σ = 28293311990. Its totient is φ = 28293311988.

The previous prime is 28293311951. The next prime is 28293311993. The reversal of 28293311989 is 98911339282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20865802500 + 7427509489 = 144450^2 + 86183^2 .

It is a cyclic number.

It is not a de Polignac number, because 28293311989 - 2²⁷ = 28159094261 is a prime.

It is a super-2 number, since 2×28293311989² (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 (28293311489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14146655994 + 14146655995.

It is an arithmetic number, because the mean of its divisors is an integer number (14146655995).

Almost surely, 2^28293311989 is an apocalyptic number.

It is an amenable number.

28293311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28293311989 is an equidigital number, since it uses as much as digits as its factorization.

28293311989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The spelling of 28293311989 in words is "twenty-eight billion, two hundred ninety-three million, three hundred eleven thousand, nine hundred eighty-nine".