191630220 has 96 divisors (see below), whose sum is σ = 557383680. Its totient is φ = 49140480.

The previous prime is 191630209. The next prime is 191630293. The reversal of 191630220 is 22036191.

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 31 ways as a sum of consecutive naturals, for example, 500149 + ... + 500531.

It is an arithmetic number, because the mean of its divisors is an integer number (5806080).

Almost surely, 2^191630220 is an apocalyptic number.

191630220 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 191630220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278691840).

191630220 is an abundant number, since it is smaller than the sum of its proper divisors (365753460).

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

191630220 is a wasteful number, since it uses less digits than its factorization.

191630220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 191630220 is about 13843.0567433642. The cubic root of 191630220 is about 576.5292324354.

The spelling of 191630220 in words is "one hundred ninety-one million, six hundred thirty thousand, two hundred twenty".