197728650 has 144 divisors (see below), whose sum is σ = 622335168. Its totient is φ = 44064000.

The previous prime is 197728639. The next prime is 197728669. The reversal of 197728650 is 56827791.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 197728596 and 197728605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128385 + ... + 129915.

It is an arithmetic number, because the mean of its divisors is an integer number (4321772).

Almost surely, 2^197728650 is an apocalyptic number.

197728650 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 197728650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311167584).

197728650 is an abundant number, since it is smaller than the sum of its proper divisors (424606518).

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

197728650 is a wasteful number, since it uses less digits than its factorization.

197728650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 197728650 is about 14061.6019713260. The cubic root of 197728650 is about 582.5812911900.

The spelling of 197728650 in words is "one hundred ninety-seven million, seven hundred twenty-eight thousand, six hundred fifty".