1278949363880 has 64 divisors (see below), whose sum is σ = 2899622880000. Its totient is φ = 507685549824.

The previous prime is 1278949363859. The next prime is 1278949363963. The reversal of 1278949363880 is 883639498721.

It is a happy number.

It is a super-2 number, since 2×1278949363880² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1278949363880.

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, 2584721 + ... + 3039519.

It is an arithmetic number, because the mean of its divisors is an integer number (45306607500).

Almost surely, 2^{1278949363880} is an apocalyptic number.

1278949363880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278949363880 is an abundant number, since it is smaller than the sum of its proper divisors (1620673516120).

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

1278949363880 is a wasteful number, since it uses less digits than its factorization.

1278949363880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455346 (or 455342 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 1278949363880 in words is "one trillion, two hundred seventy-eight billion, nine hundred forty-nine million, three hundred sixty-three thousand, eight hundred eighty".