195661620 has 288 divisors, whose sum is σ = 779950080. Its totient is φ = 38465280.

The previous prime is 195661603. The next prime is 195661633. The reversal of 195661620 is 26166591.

195661620 is a `hidden beast` number, since 19 + 5 + 6 + 616 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 262969 + ... + 263711.

It is an arithmetic number, because the mean of its divisors is an integer number (2708160).

Almost surely, 2^195661620 is an apocalyptic number.

195661620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 195661620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389975040).

195661620 is an abundant number, since it is smaller than the sum of its proper divisors (584288460).

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

195661620 is a wasteful number, since it uses less digits than its factorization.

195661620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 195661620 is about 13987.9097795203. The cubic root of 195661620 is about 580.5440990119.

The spelling of 195661620 in words is "one hundred ninety-five million, six hundred sixty-one thousand, six hundred twenty".