78555560 has 16 divisors (see below), whose sum is σ = 176750100. Its totient is φ = 31422208.

The previous prime is 78555509. The next prime is 78555569. The reversal of 78555560 is 6555587.

It can be written as a sum of positive squares in 2 ways, for example, as 72012196 + 6543364 = 8486^2 + 2558^2 .

It is not an unprimeable number, because it can be changed into a prime (78555569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981905 + ... + 981984.

Almost surely, 2^78555560 is an apocalyptic number.

It is an amenable number.

78555560 is an abundant number, since it is smaller than the sum of its proper divisors (98194540).

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

78555560 is a wasteful number, since it uses less digits than its factorization.

78555560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963900 (or 1963896 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 41.

The square root of 78555560 is about 8863.1574509314. The cubic root of 78555560 is about 428.2778787675.

The spelling of 78555560 in words is "seventy-eight million, five hundred fifty-five thousand, five hundred sixty".