208161280 has 160 divisors (see below), whose sum is σ = 535822848. Its totient is φ = 77414400.

The previous prime is 208161271. The next prime is 208161281. The reversal of 208161280 is 82161802.

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

It is a super-2 number, since 2×208161280² = 86662236982476800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208161281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3412450 + ... + 3412510.

Almost surely, 2^208161280 is an apocalyptic number.

208161280 is a gapful number since it is divisible by the number (20) 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 208161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267911424).

208161280 is an abundant number, since it is smaller than the sum of its proper divisors (327661568).

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

208161280 is an equidigital number, since it uses as much as digits as its factorization.

208161280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 208161280 is about 14427.7953963868. The cubic root of 208161280 is about 592.6523123765.

The spelling of 208161280 in words is "two hundred eight million, one hundred sixty-one thousand, two hundred eighty".