78749845784 has 16 divisors (see below), whose sum is σ = 147710709000. Its totient is φ = 39360323392.

The previous prime is 78749845753. The next prime is 78749845787. The reversal of 78749845784 is 48754894787.

It is a super-2 number, since 2×78749845784² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78749845787) 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 3 ways as a sum of consecutive naturals, for example, 1801997 + ... + 1845180.

Almost surely, 2^78749845784 is an apocalyptic number.

It is an amenable number.

78749845784 is a deficient number, since it is larger than the sum of its proper divisors (68960863216).

78749845784 is a wasteful number, since it uses less digits than its factorization.

78749845784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649882 (or 3649878 counting only the distinct ones).

The product of its digits is 505774080, while the sum is 71.

The spelling of 78749845784 in words is "seventy-eight billion, seven hundred forty-nine million, eight hundred forty-five thousand, seven hundred eighty-four".