1278705874680 has 320 divisors, whose sum is σ = 4646527079040. Its totient is φ = 313530974208.

The previous prime is 1278705874619. The next prime is 1278705874717. The reversal of 1278705874680 is 864785078721.

1278705874680 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 7 + 0 + 587 + 46 + 8 + 0 = 666.

It is a super-2 number, since 2×1278705874680² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10765777 + ... + 10883903.

It is an arithmetic number, because the mean of its divisors is an integer number (14520397122).

Almost surely, 2^{1278705874680} is an apocalyptic number.

1278705874680 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 1278705874680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2323263539520).

1278705874680 is an abundant number, since it is smaller than the sum of its proper divisors (3367821204360).

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

1278705874680 is a wasteful number, since it uses less digits than its factorization.

1278705874680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118420 (or 118407 counting only the distinct ones).

The product of its (nonzero) digits is 42147840, while the sum is 63.

The spelling of 1278705874680 in words is "one trillion, two hundred seventy-eight billion, seven hundred five million, eight hundred seventy-four thousand, six hundred eighty".