161538768 has 60 divisors (see below), whose sum is σ = 466680448. Its totient is φ = 52107840.

The previous prime is 161538761. The next prime is 161538791. The reversal of 161538768 is 867835161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161538761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13630 + ... + 22557.

Almost surely, 2^161538768 is an apocalyptic number.

161538768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161538768 is an abundant number, since it is smaller than the sum of its proper divisors (305141680).

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

161538768 is a wasteful number, since it uses less digits than its factorization.

161538768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36232 (or 36223 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 161538768 is about 12709.7902421716. The cubic root of 161538768 is about 544.6183316600.

The spelling of 161538768 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, seven hundred sixty-eight".