196540978720 has 96 divisors (see below), whose sum is σ = 467564538672. Its totient is φ = 78069891072.

The previous prime is 196540978657. The next prime is 196540978747. The reversal of 196540978720 is 27879045691.

It can be written as a sum of positive squares in 8 ways, for example, as 28155497616 + 168385481104 = 167796^2 + 410348^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18306474 + ... + 18317206.

Almost surely, 2^196540978720 is an apocalyptic number.

196540978720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 196540978720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233782269336).

196540978720 is an abundant number, since it is smaller than the sum of its proper divisors (271023559952).

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

196540978720 is a wasteful number, since it uses less digits than its factorization.

196540978720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11534 (or 11526 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 196540978720 in words is "one hundred ninety-six billion, five hundred forty million, nine hundred seventy-eight thousand, seven hundred twenty".