78390573846 has 64 divisors (see below), whose sum is σ = 176343955200. Its totient is φ = 23070462336.

The previous prime is 78390573763. The next prime is 78390573847. The reversal of 78390573846 is 64837509387.

It is a super-2 number, since 2×78390573846² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78390573846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78390573847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59916 + ... + 400463.

It is an arithmetic number, because the mean of its divisors is an integer number (2755374300).

Almost surely, 2^78390573846 is an apocalyptic number.

78390573846 is an abundant number, since it is smaller than the sum of its proper divisors (97953381354).

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

78390573846 is a wasteful number, since it uses less digits than its factorization.

78390573846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460493.

The product of its (nonzero) digits is 30481920, while the sum is 60.

The spelling of 78390573846 in words is "seventy-eight billion, three hundred ninety million, five hundred seventy-three thousand, eight hundred forty-six".