78198193872 has 30 divisors (see below), whose sum is σ = 218846334642. Its totient is φ = 26066064576.

The previous prime is 78198193867. The next prime is 78198193921. The reversal of 78198193872 is 27839189187.

It can be written as a sum of positive squares in only one way, i.e., 69297403536 + 8900790336 = 263244^2 + 94344^2 .

It is a super-2 number, since 2×78198193872² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 271521363 + ... + 271521650.

Almost surely, 2^78198193872 is an apocalyptic number.

78198193872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78198193872 is an abundant number, since it is smaller than the sum of its proper divisors (140648140770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78198193872 is a wasteful number, since it uses less digits than its factorization.

78198193872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543043027 (or 543043018 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 78198193872 in words is "seventy-eight billion, one hundred ninety-eight million, one hundred ninety-three thousand, eight hundred seventy-two".