161489568 has 48 divisors (see below), whose sum is σ = 426111840. Its totient is φ = 53550336.

The previous prime is 161489561. The next prime is 161489591. The reversal of 161489568 is 865984161.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (161489561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14643 + ... + 23181.

It is an arithmetic number, because the mean of its divisors is an integer number (8877330).

Almost surely, 2^161489568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161489568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213055920).

161489568 is an abundant number, since it is smaller than the sum of its proper divisors (264622272).

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

161489568 is a wasteful number, since it uses less digits than its factorization.

161489568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749 (or 8741 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 161489568 is about 12707.8545789602. The cubic root of 161489568 is about 544.5630344228.

The spelling of 161489568 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, five hundred sixty-eight".