199668780 has 96 divisors (see below), whose sum is σ = 635712000. Its totient is φ = 52000704.

The previous prime is 199668769. The next prime is 199668817. The reversal of 199668780 is 87866991.

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

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, 18921 + ... + 27519.

It is an arithmetic number, because the mean of its divisors is an integer number (6622000).

Almost surely, 2^199668780 is an apocalyptic number.

199668780 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 199668780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317856000).

199668780 is an abundant number, since it is smaller than the sum of its proper divisors (436043220).

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

199668780 is a wasteful number, since it uses less digits than its factorization.

199668780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660 (or 8652 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 199668780 is about 14130.4203759124. The cubic root of 199668780 is about 584.4805382132.

The spelling of 199668780 in words is "one hundred ninety-nine million, six hundred sixty-eight thousand, seven hundred eighty".