195781530 has 64 divisors (see below), whose sum is σ = 540691200. Its totient is φ = 44442624.

The previous prime is 195781507. The next prime is 195781559. The reversal of 195781530 is 35187591.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28162 + ... + 34418.

It is an arithmetic number, because the mean of its divisors is an integer number (8448300).

Almost surely, 2^195781530 is an apocalyptic number.

195781530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 195781530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270345600).

195781530 is an abundant number, since it is smaller than the sum of its proper divisors (344909670).

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

195781530 is a wasteful number, since it uses less digits than its factorization.

195781530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6423.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 195781530 is about 13992.1953245372. The cubic root of 195781530 is about 580.6626690669.

The spelling of 195781530 in words is "one hundred ninety-five million, seven hundred eighty-one thousand, five hundred thirty".