197720320 has 72 divisors (see below), whose sum is σ = 541283904. Its totient is φ = 67786752.

The previous prime is 197720309. The next prime is 197720323. The reversal of 197720320 is 23027791.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (197720323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074 + ... + 19993.

It is an arithmetic number, because the mean of its divisors is an integer number (7517832).

Almost surely, 2^197720320 is an apocalyptic number.

197720320 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 197720320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270641952).

197720320 is an abundant number, since it is smaller than the sum of its proper divisors (343563584).

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

197720320 is an equidigital number, since it uses as much as digits as its factorization.

197720320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22095 (or 22081 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 197720320 is about 14061.3057715135. The cubic root of 197720320 is about 582.5731099944.

The spelling of 197720320 in words is "one hundred ninety-seven million, seven hundred twenty thousand, three hundred twenty".