12640240620 has 192 divisors, whose sum is σ = 44996797440. Its totient is φ = 2885746176.

The previous prime is 12640240619. The next prime is 12640240621. The reversal of 12640240620 is 2604204621.

12640240620 is a `hidden beast` number, since 12 + 6 + 4 + 0 + 24 + 0 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (12640240619) and next prime (12640240621).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12640240621) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 4508139 + ... + 4510941.

It is an arithmetic number, because the mean of its divisors is an integer number (234358320).

Almost surely, 2^12640240620 is an apocalyptic number.

12640240620 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 12640240620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22498398720).

12640240620 is an abundant number, since it is smaller than the sum of its proper divisors (32356556820).

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

12640240620 is a wasteful number, since it uses less digits than its factorization.

12640240620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021 (or 4013 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 12640240620 in words is "twelve billion, six hundred forty million, two hundred forty thousand, six hundred twenty".