196671640 has 64 divisors (see below), whose sum is σ = 511155360. Its totient is φ = 67307520.

The previous prime is 196671617. The next prime is 196671661. The reversal of 196671640 is 46176691.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 196671593 and 196671602.

It is a congruent number.

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, 5667 + ... + 20626.

Almost surely, 2^196671640 is an apocalyptic number.

196671640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

196671640 is an abundant number, since it is smaller than the sum of its proper divisors (314483720).

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

196671640 is a wasteful number, since it uses less digits than its factorization.

196671640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26332 (or 26328 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 196671640 is about 14023.9666285969. The cubic root of 196671640 is about 581.5413224968.

The spelling of 196671640 in words is "one hundred ninety-six million, six hundred seventy-one thousand, six hundred forty".