181997268 has 48 divisors (see below), whose sum is σ = 430303104. Its totient is φ = 59866240.

The previous prime is 181997267. The next prime is 181997273. The reversal of 181997268 is 862799181.

181997268 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 181997268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181997267) 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, 394558 + ... + 395018.

It is an arithmetic number, because the mean of its divisors is an integer number (8964648).

Almost surely, 2^181997268 is an apocalyptic number.

It is an amenable number.

181997268 is an abundant number, since it is smaller than the sum of its proper divisors (248305836).

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

181997268 is a wasteful number, since it uses less digits than its factorization.

181997268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 830 counting only the distinct ones).

The product of its digits is 435456, while the sum is 51.

The square root of 181997268 is about 13490.6363081954. The cubic root of 181997268 is about 566.7022751941.

The spelling of 181997268 in words is "one hundred eighty-one million, nine hundred ninety-seven thousand, two hundred sixty-eight".