196664640 has 56 divisors (see below), whose sum is σ = 624413280. Its totient is φ = 52443648.

The previous prime is 196664639. The next prime is 196664647. The reversal of 196664640 is 46466691.

196664640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 196664592 and 196664601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196664647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101470 + ... + 103389.

Almost surely, 2^196664640 is an apocalyptic number.

196664640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

196664640 is an abundant number, since it is smaller than the sum of its proper divisors (427748640).

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

196664640 is a wasteful number, since it uses less digits than its factorization.

196664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204879 (or 204869 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 196664640 is about 14023.7170536203. The cubic root of 196664640 is about 581.5344229466.

The spelling of 196664640 in words is "one hundred ninety-six million, six hundred sixty-four thousand, six hundred forty".