12187857780 has 480 divisors, whose sum is σ = 46226847744. Its totient is φ = 2627894016.

The previous prime is 12187857763. The next prime is 12187857797. The reversal of 12187857780 is 8775878121.

It is an interprime number because it is at equal distance from previous prime (12187857763) and next prime (12187857797).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 21647779 + ... + 21648341.

Almost surely, 2^12187857780 is an apocalyptic number.

12187857780 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 12187857780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23113423872).

12187857780 is an abundant number, since it is smaller than the sum of its proper divisors (34038989964).

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

12187857780 is a wasteful number, since it uses less digits than its factorization.

12187857780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 1756160, while the sum is 54.

The spelling of 12187857780 in words is "twelve billion, one hundred eighty-seven million, eight hundred fifty-seven thousand, seven hundred eighty".