12549764220 has 192 divisors, whose sum is σ = 41152720896. Its totient is φ = 2797977600.

The previous prime is 12549764209. The next prime is 12549764221. The reversal of 12549764220 is 2246794521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12549764221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6967320 + ... + 6969120.

It is an arithmetic number, because the mean of its divisors is an integer number (214337088).

Almost surely, 2^12549764220 is an apocalyptic number.

12549764220 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 12549764220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20576360448).

12549764220 is an abundant number, since it is smaller than the sum of its proper divisors (28602956676).

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

12549764220 is a wasteful number, since it uses less digits than its factorization.

12549764220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220 (or 2218 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 12549764220 in words is "twelve billion, five hundred forty-nine million, seven hundred sixty-four thousand, two hundred twenty".