12278028637820 has 96 divisors (see below), whose sum is σ = 28264107755520. Its totient is φ = 4443127637760.

The previous prime is 12278028637813. The next prime is 12278028637837. The reversal of 12278028637820 is 2873682087221.

12278028637820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12278028637820² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107907479 + ... + 108021201.

It is an arithmetic number, because the mean of its divisors is an integer number (294417789120).

Almost surely, 2^{12278028637820} is an apocalyptic number.

12278028637820 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 12278028637820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14132053877760).

12278028637820 is an abundant number, since it is smaller than the sum of its proper divisors (15986079117700).

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

12278028637820 is a wasteful number, since it uses less digits than its factorization.

12278028637820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116115 (or 116113 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 12278028637820 in words is "twelve trillion, two hundred seventy-eight billion, twenty-eight million, six hundred thirty-seven thousand, eight hundred twenty".