161604324 has 36 divisors (see below), whose sum is σ = 466857664. Its totient is φ = 46172592.

The previous prime is 161604323. The next prime is 161604337. The reversal of 161604324 is 423406161.

161604324 is a `hidden beast` number, since 1 + 616 + 0 + 43 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161604324² = 52231915070993952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161604323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320392 + ... + 320895.

Almost surely, 2^161604324 is an apocalyptic number.

161604324 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161604324 is an abundant number, since it is smaller than the sum of its proper divisors (305253340).

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

161604324 is a wasteful number, since it uses less digits than its factorization.

161604324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641304 (or 641299 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 161604324 is about 12712.3689373775. The cubic root of 161604324 is about 544.6919944123.

It can be divided in two parts, 161604 and 324, that multiplied together give a square (52359696 = 7236²).

The spelling of 161604324 in words is "one hundred sixty-one million, six hundred four thousand, three hundred twenty-four".