78343911504 has 120 divisors (see below), whose sum is σ = 230769084000. Its totient is φ = 25724780928.

The previous prime is 78343911449. The next prime is 78343911517. The reversal of 78343911504 is 40511934387.

78343911504 is a `hidden beast` number, since 78 + 34 + 39 + 11 + 504 = 666.

It is a super-2 number, since 2×78343911504² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78343911504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110122 + ... + 410870.

It is an arithmetic number, because the mean of its divisors is an integer number (1923075700).

Almost surely, 2^78343911504 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 78343911504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115384542000).

78343911504 is an abundant number, since it is smaller than the sum of its proper divisors (152425172496).

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

78343911504 is a wasteful number, since it uses less digits than its factorization.

78343911504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300839 (or 300821 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 78343911504 in words is "seventy-eight billion, three hundred forty-three million, nine hundred eleven thousand, five hundred four".