28961361293 has 4 divisors (see below), whose sum is σ = 28997700060. Its totient is φ = 28925022528.

The previous prime is 28961361271. The next prime is 28961361307. The reversal of 28961361293 is 39216316982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39216316982 = 2 ⋅19608158491.

It can be written as a sum of positive squares in 2 ways, for example, as 19655479204 + 9305882089 = 140198^2 + 96467^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961361293 - 2²² = 28957166989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961361493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18168188 + ... + 18169781.

It is an arithmetic number, because the mean of its divisors is an integer number (7249425015).

Almost surely, 2^28961361293 is an apocalyptic number.

It is an amenable number.

28961361293 is a deficient number, since it is larger than the sum of its proper divisors (36338767).

28961361293 is an equidigital number, since it uses as much as digits as its factorization.

28961361293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36338766.

The product of its digits is 839808, while the sum is 50.

The spelling of 28961361293 in words is "twenty-eight billion, nine hundred sixty-one million, three hundred sixty-one thousand, two hundred ninety-three".