195966864 has 140 divisors (see below), whose sum is σ = 581838876. Its totient is φ = 63887616.

The previous prime is 195966863. The next prime is 195966899. The reversal of 195966864 is 468669591.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67371264 + 128595600 = 8208^2 + 11340^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 195966864.

It is not an unprimeable number, because it can be changed into a prime (195966863) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 618034 + ... + 618350.

Almost surely, 2^195966864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 195966864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290919438).

195966864 is an abundant number, since it is smaller than the sum of its proper divisors (385872012).

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

195966864 is an equidigital number, since it uses as much as digits as its factorization.

195966864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 375 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 195966864 is about 13998.8165214064. The cubic root of 195966864 is about 580.8458368305.

The spelling of 195966864 in words is "one hundred ninety-five million, nine hundred sixty-six thousand, eight hundred sixty-four".