12215178432 has 336 divisors, whose sum is σ = 38853709440. Its totient is φ = 3793692672.

The previous prime is 12215178407. The next prime is 12215178439. The reversal of 12215178432 is 23487151221.

12215178432 is a `hidden beast` number, since 1 + 2 + 2 + 151 + 78 + 432 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12215178439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19797388 + ... + 19798004.

It is an arithmetic number, because the mean of its divisors is an integer number (115636040).

Almost surely, 2^12215178432 is an apocalyptic number.

12215178432 is a gapful number since it is divisible by the number (12) 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 12215178432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19426854720).

12215178432 is an abundant number, since it is smaller than the sum of its proper divisors (26638531008).

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

12215178432 is an equidigital number, since it uses as much as digits as its factorization.

12215178432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 708 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The spelling of 12215178432 in words is "twelve billion, two hundred fifteen million, one hundred seventy-eight thousand, four hundred thirty-two".