78371443994 has 32 divisors (see below), whose sum is σ = 125223189840. Its totient is φ = 36720230400.

The previous prime is 78371443987. The next prime is 78371444059. The reversal of 78371443994 is 49934417387.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10529427769 + 67842016225 = 102613^2 + 260465^2 .

It is a super-2 number, since 2×78371443994² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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, 373574 + ... + 544334.

Almost surely, 2^78371443994 is an apocalyptic number.

78371443994 is a deficient number, since it is larger than the sum of its proper divisors (46851745846).

78371443994 is a wasteful number, since it uses less digits than its factorization.

78371443994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171026.

The product of its digits is 18289152, while the sum is 59.

The spelling of 78371443994 in words is "seventy-eight billion, three hundred seventy-one million, four hundred forty-three thousand, nine hundred ninety-four".