195438664 has 16 divisors (see below), whose sum is σ = 388003500. Its totient is φ = 91971072.

The previous prime is 195438641. The next prime is 195438667. The reversal of 195438664 is 466834591.

It can be written as a sum of positive squares in 2 ways, for example, as 191268900 + 4169764 = 13830^2 + 2042^2 .

It is a super-2 number, since 2×195438664² = 76392542772209792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195438667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718389 + ... + 718660.

Almost surely, 2^195438664 is an apocalyptic number.

It is an amenable number.

195438664 is a deficient number, since it is larger than the sum of its proper divisors (192564836).

195438664 is a wasteful number, since it uses less digits than its factorization.

195438664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437072 (or 1437068 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The square root of 195438664 is about 13979.9379111640. The cubic root of 195438664 is about 580.3235056133.

The spelling of 195438664 in words is "one hundred ninety-five million, four hundred thirty-eight thousand, six hundred sixty-four".