78309859860 has 48 divisors (see below), whose sum is σ = 243630676800. Its totient is φ = 20882629152.

The previous prime is 78309859853. The next prime is 78309859861. The reversal of 78309859860 is 6895890387.

78309859860 is a `hidden beast` number, since 7 + 8 + 30 + 9 + 8 + 598 + 6 + 0 = 666.

It is a super-2 number, since 2×78309859860² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78309859861) 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, 72508590 + ... + 72509669.

It is an arithmetic number, because the mean of its divisors is an integer number (5075639100).

Almost surely, 2^78309859860 is an apocalyptic number.

It is an amenable number.

78309859860 is an abundant number, since it is smaller than the sum of its proper divisors (165320816940).

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

78309859860 is a wasteful number, since it uses less digits than its factorization.

78309859860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145018277 (or 145018269 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 78309859860 in words is "seventy-eight billion, three hundred nine million, eight hundred fifty-nine thousand, eight hundred sixty".