12291720078 has 32 divisors (see below), whose sum is σ = 27196031232. Its totient is φ = 3672300800.

The previous prime is 12291720043. The next prime is 12291720097. The reversal of 12291720078 is 87002719221.

12291720078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306851 + ... + 1316222.

It is an arithmetic number, because the mean of its divisors is an integer number (849875976).

Almost surely, 2^12291720078 is an apocalyptic number.

12291720078 is an abundant number, since it is smaller than the sum of its proper divisors (14904311154).

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

12291720078 is a wasteful number, since it uses less digits than its factorization.

12291720078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623160.

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 12291720078 in words is "twelve billion, two hundred ninety-one million, seven hundred twenty thousand, seventy-eight".