161632504 has 16 divisors (see below), whose sum is σ = 330612120. Its totient is φ = 73469280.

The previous prime is 161632489. The next prime is 161632507. The reversal of 161632504 is 405236161.

It is a super-2 number, since 2×161632504² = 52250132698620032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161632507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918279 + ... + 918454.

Almost surely, 2^161632504 is an apocalyptic number.

It is an amenable number.

161632504 is an abundant number, since it is smaller than the sum of its proper divisors (168979616).

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

161632504 is a wasteful number, since it uses less digits than its factorization.

161632504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836750 (or 1836746 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 161632504 is about 12713.4772584057. The cubic root of 161632504 is about 544.7236530708.

Adding to 161632504 its reverse (405236161), we get a palindrome (566868665).

The spelling of 161632504 in words is "one hundred sixty-one million, six hundred thirty-two thousand, five hundred four".