278747968128 has 128 divisors (see below), whose sum is σ = 846367211520. Its totient is φ = 79626464256.

The previous prime is 278747968127. The next prime is 278747968133. The reversal of 278747968128 is 821869747872.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (278747968123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23602801 + ... + 23614607.

It is an arithmetic number, because the mean of its divisors is an integer number (6612243840).

Almost surely, 2^278747968128 is an apocalyptic number.

278747968128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

278747968128 is an abundant number, since it is smaller than the sum of its proper divisors (567619243392).

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

278747968128 is a wasteful number, since it uses less digits than its factorization.

278747968128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20614 (or 20602 counting only the distinct ones).

The product of its digits is 151732224, while the sum is 69.

The spelling of 278747968128 in words is "two hundred seventy-eight billion, seven hundred forty-seven million, nine hundred sixty-eight thousand, one hundred twenty-eight".