78204424392 has 48 divisors (see below), whose sum is σ = 216729324240. Its totient is φ = 25461904608.

The previous prime is 78204424387. The next prime is 78204424393. The reversal of 78204424392 is 29342440287.

It is a happy number.

78204424392 is a `hidden beast` number, since 7 + 8 + 204 + 4 + 2 + 439 + 2 = 666.

It is a super-2 number, since 2×78204424392² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78204424393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12626818 + ... + 12633009.

It is an arithmetic number, because the mean of its divisors is an integer number (4515194255).

Almost surely, 2^78204424392 is an apocalyptic number.

78204424392 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78204424392 is an abundant number, since it is smaller than the sum of its proper divisors (138524899848).

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

78204424392 is a wasteful number, since it uses less digits than its factorization.

78204424392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25259882 (or 25259875 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 78204424392 in words is "seventy-eight billion, two hundred four million, four hundred twenty-four thousand, three hundred ninety-two".