278789128480 has 24 divisors (see below), whose sum is σ = 658639316412. Its totient is φ = 111515651328.

The previous prime is 278789128447. The next prime is 278789128489. The reversal of 278789128480 is 84821987872.

It can be written as a sum of positive squares in 2 ways, for example, as 267127720336 + 11661408144 = 516844^2 + 107988^2 .

It is a super-2 number, since 2×278789128480² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (278789128489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871215867 + ... + 871216186.

Almost surely, 2^278789128480 is an apocalyptic number.

278789128480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278789128480 is an abundant number, since it is smaller than the sum of its proper divisors (379850187932).

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

278789128480 is a wasteful number, since it uses less digits than its factorization.

278789128480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742432068 (or 1742432060 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 64.

The spelling of 278789128480 in words is "two hundred seventy-eight billion, seven hundred eighty-nine million, one hundred twenty-eight thousand, four hundred eighty".