195721680 has 480 divisors, whose sum is σ = 824411520. Its totient is φ = 37847040.

The previous prime is 195721661. The next prime is 195721709. The reversal of 195721680 is 86127591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2199076 + ... + 2199164.

It is an arithmetic number, because the mean of its divisors is an integer number (1717524).

Almost surely, 2^195721680 is an apocalyptic number.

195721680 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 195721680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412205760).

195721680 is an abundant number, since it is smaller than the sum of its proper divisors (628689840).

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

195721680 is a wasteful number, since it uses less digits than its factorization.

195721680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 195721680 is about 13990.0564687924. The cubic root of 195721680 is about 580.6034939196.

The spelling of 195721680 in words is "one hundred ninety-five million, seven hundred twenty-one thousand, six hundred eighty".