78204818520 has 512 divisors, whose sum is σ = 286623360000. Its totient is φ = 18890661888.

The previous prime is 78204818509. The next prime is 78204818521. The reversal of 78204818520 is 2581840287.

It is a happy number.

78204818520 is a `hidden beast` number, since 7 + 82 + 0 + 48 + 1 + 8 + 520 = 666.

It is a super-2 number, since 2×78204818520² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78204818521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 67243459 + ... + 67244621.

It is an arithmetic number, because the mean of its divisors is an integer number (559811250).

Almost surely, 2^78204818520 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 78204818520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143311680000).

78204818520 is an abundant number, since it is smaller than the sum of its proper divisors (208418541480).

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

78204818520 is a wasteful number, since it uses less digits than its factorization.

78204818520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 78204818520 in words is "seventy-eight billion, two hundred four million, eight hundred eighteen thousand, five hundred twenty".