195978272 has 72 divisors (see below), whose sum is σ = 449842176. Its totient is φ = 82325376.

The previous prime is 195978269. The next prime is 195978281. The reversal of 195978272 is 272879591.

It is a super-2 number, since 2×195978272² = 76814966192211968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 195978272.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1543073 + ... + 1543199.

It is an arithmetic number, because the mean of its divisors is an integer number (6247808).

Almost surely, 2^195978272 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 195978272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224921088).

195978272 is an abundant number, since it is smaller than the sum of its proper divisors (253863904).

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

195978272 is an equidigital number, since it uses as much as digits as its factorization.

195978272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 219 counting only the distinct ones).

The product of its digits is 635040, while the sum is 50.

The square root of 195978272 is about 13999.2239784925. The cubic root of 195978272 is about 580.8571077168.

The spelling of 195978272 in words is "one hundred ninety-five million, nine hundred seventy-eight thousand, two hundred seventy-two".