12773427820 has 96 divisors (see below), whose sum is σ = 28189679616. Its totient is φ = 4856716800.

The previous prime is 12773427781. The next prime is 12773427827. The reversal of 12773427820 is 2872437721.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12773427827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10443729 + ... + 10444951.

It is an arithmetic number, because the mean of its divisors is an integer number (293642496).

Almost surely, 2^12773427820 is an apocalyptic number.

12773427820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12773427820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14094839808).

12773427820 is an abundant number, since it is smaller than the sum of its proper divisors (15416251796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12773427820 is a wasteful number, since it uses less digits than its factorization.

12773427820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 43.

Subtracting from 12773427820 its reverse (2872437721), we obtain a palindrome (9900990099).

The spelling of 12773427820 in words is "twelve billion, seven hundred seventy-three million, four hundred twenty-seven thousand, eight hundred twenty".