12540003320 has 64 divisors (see below), whose sum is σ = 30466044000. Its totient is φ = 4617865728.

The previous prime is 12540003319. The next prime is 12540003341. The reversal of 12540003320 is 2330004521.

It is a happy number.

It is a super-2 number, since 2×12540003320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12540003292 and 12540003301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165266 + ... + 228894.

Almost surely, 2^12540003320 is an apocalyptic number.

12540003320 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 12540003320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15233022000).

12540003320 is an abundant number, since it is smaller than the sum of its proper divisors (17926040680).

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

12540003320 is a wasteful number, since it uses less digits than its factorization.

12540003320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64032 (or 64028 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 12540003320 its reverse (2330004521), we get a palindrome (14870007841).

The spelling of 12540003320 in words is "twelve billion, five hundred forty million, three thousand, three hundred twenty".