195066640 has 40 divisors (see below), whose sum is σ = 458642520. Its totient is φ = 77147136.

The previous prime is 195066541. The next prime is 195066649. The reversal of 195066640 is 46660591.

It can be written as a sum of positive squares in 4 ways, for example, as 13571856 + 181494784 = 3684^2 + 13472^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 195066640.

It is not an unprimeable number, because it can be changed into a prime (195066649) 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, 6579 + ... + 20818.

It is an arithmetic number, because the mean of its divisors is an integer number (11466063).

Almost surely, 2^195066640 is an apocalyptic number.

195066640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195066640 is an abundant number, since it is smaller than the sum of its proper divisors (263575880).

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

195066640 is a wasteful number, since it uses less digits than its factorization.

195066640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27499 (or 27493 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 195066640 is about 13966.6259347059. The cubic root of 195066640 is about 579.9550500242.

The spelling of 195066640 in words is "one hundred ninety-five million, sixty-six thousand, six hundred forty".