78512844840 has 32 divisors (see below), whose sum is σ = 235538534880. Its totient is φ = 20936758592.

The previous prime is 78512844769. The next prime is 78512844847. The reversal of 78512844840 is 4844821587.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78512844847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327136734 + ... + 327136973.

It is an arithmetic number, because the mean of its divisors is an integer number (7360579215).

Almost surely, 2^78512844840 is an apocalyptic number.

It is an amenable number.

78512844840 is an abundant number, since it is smaller than the sum of its proper divisors (157025690040).

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

78512844840 is a wasteful number, since it uses less digits than its factorization.

78512844840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654273721 (or 654273717 counting only the distinct ones).

The product of its (nonzero) digits is 2293760, while the sum is 51.

The spelling of 78512844840 in words is "seventy-eight billion, five hundred twelve million, eight hundred forty-four thousand, eight hundred forty".