197639680 has 160 divisors (see below), whose sum is σ = 556839360. Its totient is φ = 65863680.

The previous prime is 197639641. The next prime is 197639693. The reversal of 197639680 is 86936791.

197639680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×197639680² = 78122886221004800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734586 + ... + 734854.

It is an arithmetic number, because the mean of its divisors is an integer number (3480246).

Almost surely, 2^197639680 is an apocalyptic number.

197639680 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 197639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278419680).

197639680 is an abundant number, since it is smaller than the sum of its proper divisors (359199680).

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

197639680 is an equidigital number, since it uses as much as digits as its factorization.

197639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 197639680 is about 14058.4380355714. The cubic root of 197639680 is about 582.4938986387.

The spelling of 197639680 in words is "one hundred ninety-seven million, six hundred thirty-nine thousand, six hundred eighty".