78118338790 has 32 divisors (see below), whose sum is σ = 142803410976. Its totient is φ = 30762167040.

The previous prime is 78118338731. The next prime is 78118338791. The reversal of 78118338790 is 9783381187.

It is a happy number.

It is a super-2 number, since 2×78118338790² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78118338791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296029 + ... + 493831.

It is an arithmetic number, because the mean of its divisors is an integer number (4462606593).

Almost surely, 2^78118338790 is an apocalyptic number.

78118338790 is a deficient number, since it is larger than the sum of its proper divisors (64685072186).

78118338790 is a wasteful number, since it uses less digits than its factorization.

78118338790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198424.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 78118338790 in words is "seventy-eight billion, one hundred eighteen million, three hundred thirty-eight thousand, seven hundred ninety".