78817193536 has 63 divisors (see below), whose sum is σ = 165157266459. Its totient is φ = 37314246528.

The previous prime is 78817193531. The next prime is 78817193549. The reversal of 78817193536 is 63539171887.

The square root of 78817193536 is 280744.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78817193531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42672165 + ... + 42674011.

Almost surely, 2^78817193536 is an apocalyptic number.

78817193536 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

78817193536 is the 280744-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78817193536

78817193536 is an abundant number, since it is smaller than the sum of its proper divisors (86340072923).

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

78817193536 is an frugal number, since it uses more digits than its factorization.

78817193536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744 (or 1868 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 58.

The spelling of 78817193536 in words is "seventy-eight billion, eight hundred seventeen million, one hundred ninety-three thousand, five hundred thirty-six".