9812780323 has 4 divisors (see below), whose sum is σ = 10077990640. Its totient is φ = 9547570008.

The previous prime is 9812780303. The next prime is 9812780333. The reversal of 9812780323 is 3230872189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9812780323 - 2⁵ = 9812780291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9812780323.

It is not an unprimeable number, because it can be changed into a prime (9812780303) 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, 132605103 + ... + 132605176.

It is an arithmetic number, because the mean of its divisors is an integer number (2519497660).

Almost surely, 2^9812780323 is an apocalyptic number.

9812780323 is a deficient number, since it is larger than the sum of its proper divisors (265210317).

9812780323 is a wasteful number, since it uses less digits than its factorization.

9812780323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265210316.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 9812780323 is about 99059.4787135487. The cubic root of 9812780323 is about 2140.9048145597.

The spelling of 9812780323 in words is "nine billion, eight hundred twelve million, seven hundred eighty thousand, three hundred twenty-three".