161984784 has 80 divisors (see below), whose sum is σ = 461206592. Its totient is φ = 48674304.

The previous prime is 161984783. The next prime is 161984813. The reversal of 161984784 is 487489161.

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 (161984783) 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, 23814 + ... + 29850.

Almost surely, 2^161984784 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 161984784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230603296).

161984784 is an abundant number, since it is smaller than the sum of its proper divisors (299221808).

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

161984784 is a wasteful number, since it uses less digits than its factorization.

161984784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104 (or 6098 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 161984784 is about 12727.3243063890. The cubic root of 161984784 is about 545.1191098418.

The spelling of 161984784 in words is "one hundred sixty-one million, nine hundred eighty-four thousand, seven hundred eighty-four".