78888398660 has 48 divisors (see below), whose sum is σ = 167208678000. Its totient is φ = 31262544384.

The previous prime is 78888398647. The next prime is 78888398723. The reversal of 78888398660 is 6689388887.

It can be written as a sum of positive squares in 8 ways, for example, as 24288599104 + 54599799556 = 155848^2 + 233666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125194 + ... + 1193246.

It is an arithmetic number, because the mean of its divisors is an integer number (3483514125).

Almost surely, 2^78888398660 is an apocalyptic number.

It is an amenable number.

78888398660 is an abundant number, since it is smaller than the sum of its proper divisors (88320279340).

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

78888398660 is a wasteful number, since it uses less digits than its factorization.

78888398660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68600 (or 68598 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 71.

The spelling of 78888398660 in words is "seventy-eight billion, eight hundred eighty-eight million, three hundred ninety-eight thousand, six hundred sixty".