78372896173 has 64 divisors (see below), whose sum is σ = 96522015744. Its totient is φ = 62682048000.

The previous prime is 78372896167. The next prime is 78372896191. The reversal of 78372896173 is 37169827387.

It is a de Polignac number, because none of the positive numbers 2^k-78372896173 is a prime.

It is a super-2 number, since 2×78372896173² (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 (78372896153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51458790 + ... + 51460312.

It is an arithmetic number, because the mean of its divisors is an integer number (1508156496).

Almost surely, 2^78372896173 is an apocalyptic number.

It is an amenable number.

78372896173 is a deficient number, since it is larger than the sum of its proper divisors (18149119571).

78372896173 is a wasteful number, since it uses less digits than its factorization.

78372896173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its digits is 21337344, while the sum is 61.

The spelling of 78372896173 in words is "seventy-eight billion, three hundred seventy-two million, eight hundred ninety-six thousand, one hundred seventy-three".