78358186640 has 160 divisors (see below), whose sum is σ = 197989042176. Its totient is φ = 28754288640.

The previous prime is 78358186633. The next prime is 78358186661. The reversal of 78358186640 is 4668185387.

It is a super-2 number, since 2×78358186640² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6439442 + ... + 6451598.

Almost surely, 2^78358186640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78358186640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98994521088).

78358186640 is an abundant number, since it is smaller than the sum of its proper divisors (119630855536).

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

78358186640 is a wasteful number, since it uses less digits than its factorization.

78358186640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337 (or 12331 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 78358186640 in words is "seventy-eight billion, three hundred fifty-eight million, one hundred eighty-six thousand, six hundred forty".