197907709788 has 72 divisors (see below), whose sum is σ = 527494705920. Its totient is φ = 62390576160.

The previous prime is 197907709763. The next prime is 197907709789. The reversal of 197907709788 is 887907709791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197907709789) 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 23 ways as a sum of consecutive naturals, for example, 155053 + ... + 647963.

It is an arithmetic number, because the mean of its divisors is an integer number (7326315360).

Almost surely, 2^197907709788 is an apocalyptic number.

197907709788 is a gapful number since it is divisible by the number (18) 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 197907709788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263747352960).

197907709788 is an abundant number, since it is smaller than the sum of its proper divisors (329586996132).

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

197907709788 is a wasteful number, since it uses less digits than its factorization.

197907709788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493527 (or 493522 counting only the distinct ones).

The product of its (nonzero) digits is 112021056, while the sum is 72.

The spelling of 197907709788 in words is "one hundred ninety-seven billion, nine hundred seven million, seven hundred nine thousand, seven hundred eighty-eight".