198022720 has 168 divisors, whose sum is σ = 559256184. Its totient is φ = 66576384.

The previous prime is 198022717. The next prime is 198022723. The reversal of 198022720 is 27220891.

It is an interprime number because it is at equal distance from previous prime (198022717) and next prime (198022723).

It can be written as a sum of positive squares in 4 ways, for example, as 62346816 + 135675904 = 7896^2 + 11648^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198022723) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1144554 + ... + 1144726.

Almost surely, 2^198022720 is an apocalyptic number.

198022720 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 198022720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279628092).

198022720 is an abundant number, since it is smaller than the sum of its proper divisors (361233464).

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

198022720 is a wasteful number, since it uses less digits than its factorization.

198022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 198022720 is about 14072.0545763581. The cubic root of 198022720 is about 582.8699609052.

It can be divided in two parts, 19802 and 2720, that added together give a palindrome (22522).

The spelling of 198022720 in words is "one hundred ninety-eight million, twenty-two thousand, seven hundred twenty".