1278883926540 has 288 divisors, whose sum is σ = 4456471219200. Its totient is φ = 293830986240.

The previous prime is 1278883926497. The next prime is 1278883926553. The reversal of 1278883926540 is 456293888721.

1278883926540 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 8 + 83 + 9 + 2 + 6 + 540 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4835041 + ... + 5092679.

It is an arithmetic number, because the mean of its divisors is an integer number (15473858400).

It is a 1-persistent number, because it is pandigital, but 2⋅1278883926540 = 2557767853080 is not.

Almost surely, 2^{1278883926540} is an apocalyptic number.

1278883926540 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 1278883926540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228235609600).

1278883926540 is an abundant number, since it is smaller than the sum of its proper divisors (3177587292660).

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

1278883926540 is a wasteful number, since it uses less digits than its factorization.

1278883926540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257797 (or 257792 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 63.

The spelling of 1278883926540 in words is "one trillion, two hundred seventy-eight billion, eight hundred eighty-three million, nine hundred twenty-six thousand, five hundred forty".