161324004 has 48 divisors (see below), whose sum is σ = 383846400. Its totient is φ = 52724256.

The previous prime is 161323993. The next prime is 161324027. The reversal of 161324004 is 400423161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157807 + ... + 158825.

It is an arithmetic number, because the mean of its divisors is an integer number (7996800).

Almost surely, 2^161324004 is an apocalyptic number.

It is an amenable number.

161324004 is an abundant number, since it is smaller than the sum of its proper divisors (222522396).

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

161324004 is a wasteful number, since it uses less digits than its factorization.

161324004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 161324004 is about 12701.3386696049. The cubic root of 161324004 is about 544.3768699448.

Adding to 161324004 its reverse (400423161), we get a palindrome (561747165).

The spelling of 161324004 in words is "one hundred sixty-one million, three hundred twenty-four thousand, four".