78228665280 has 84 divisors (see below), whose sum is σ = 269074023192. Its totient is φ = 20860976640.

The previous prime is 78228665231. The next prime is 78228665297. The reversal of 78228665280 is 8256682287.

78228665280 is a `hidden beast` number, since 7 + 82 + 286 + 6 + 5 + 280 = 666.

It is a super-2 number, since 2×78228665280² (a number of 23 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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13578486 + ... + 13584245.

Almost surely, 2^78228665280 is an apocalyptic number.

It is an amenable number.

78228665280 is an abundant number, since it is smaller than the sum of its proper divisors (190845357912).

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

78228665280 is a wasteful number, since it uses less digits than its factorization.

78228665280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27162754 (or 27162741 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 78228665280 in words is "seventy-eight billion, two hundred twenty-eight million, six hundred sixty-five thousand, two hundred eighty".