161636832 has 72 divisors (see below), whose sum is σ = 525326256. Its totient is φ = 46181376.

The previous prime is 161636789. The next prime is 161636869. The reversal of 161636832 is 238636161.

161636832 is a `hidden beast` number, since 1 + 616 + 3 + 6 + 8 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×161636832² = 52252930917992448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38073 + ... + 42104.

It is an arithmetic number, because the mean of its divisors is an integer number (7296198).

Almost surely, 2^161636832 is an apocalyptic number.

161636832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161636832 is an abundant number, since it is smaller than the sum of its proper divisors (363689424).

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

161636832 is a wasteful number, since it uses less digits than its factorization.

161636832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80200 (or 80189 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 161636832 is about 12713.6474703367. The cubic root of 161636832 is about 544.7285150114.

The spelling of 161636832 in words is "one hundred sixty-one million, six hundred thirty-six thousand, eight hundred thirty-two".