181723968 has 42 divisors (see below), whose sum is σ = 520880594. Its totient is φ = 60574464.

The previous prime is 181723963. The next prime is 181723981. The reversal of 181723968 is 869327181.

It can be written as a sum of positive squares in only one way, i.e., 123476544 + 58247424 = 11112^2 + 7632^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181723963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157171 + ... + 158322.

Almost surely, 2^181723968 is an apocalyptic number.

181723968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

181723968 is an abundant number, since it is smaller than the sum of its proper divisors (339156626).

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

181723968 is a wasteful number, since it uses less digits than its factorization.

181723968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315511 (or 315498 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 181723968 is about 13480.5032547008. The cubic root of 181723968 is about 566.4184663136.

The spelling of 181723968 in words is "one hundred eighty-one million, seven hundred twenty-three thousand, nine hundred sixty-eight".