161304504 has 32 divisors (see below), whose sum is σ = 404576640. Its totient is φ = 53592800.

The previous prime is 161304463. The next prime is 161304511. The reversal of 161304504 is 405403161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3342 + ... + 18269.

It is an arithmetic number, because the mean of its divisors is an integer number (12643020).

Almost surely, 2^161304504 is an apocalyptic number.

It is an amenable number.

161304504 is an abundant number, since it is smaller than the sum of its proper divisors (243272136).

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

161304504 is a wasteful number, since it uses less digits than its factorization.

161304504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21931 (or 21927 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 161304504 is about 12700.5710107853. The cubic root of 161304504 is about 544.3549352535.

Adding to 161304504 its reverse (405403161), we get a palindrome (566707665).

The spelling of 161304504 in words is "one hundred sixty-one million, three hundred four thousand, five hundred four".