78845281772 has 48 divisors (see below), whose sum is σ = 143760355200. Its totient is φ = 37805940480.

The previous prime is 78845281771. The next prime is 78845281807. The reversal of 78845281772 is 27718254887.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (78845281771) 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 15 ways as a sum of consecutive naturals, for example, 8935979 + ... + 8944797.

It is an arithmetic number, because the mean of its divisors is an integer number (2995007400).

Almost surely, 2^78845281772 is an apocalyptic number.

It is an amenable number.

78845281772 is a deficient number, since it is larger than the sum of its proper divisors (64915073428).

78845281772 is a wasteful number, since it uses less digits than its factorization.

78845281772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9806 (or 9804 counting only the distinct ones).

The product of its digits is 14049280, while the sum is 59.

The spelling of 78845281772 in words is "seventy-eight billion, eight hundred forty-five million, two hundred eighty-one thousand, seven hundred seventy-two".