161784216 has 80 divisors (see below), whose sum is σ = 494362440. Its totient is φ = 49023360.

The previous prime is 161784209. The next prime is 161784229. The reversal of 161784216 is 612487161.

It is a happy number.

161784216 is a `hidden beast` number, since 161 + 78 + 421 + 6 = 666.

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

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 19 ways as a sum of consecutive naturals, for example, 4221 + ... + 18476.

Almost surely, 2^161784216 is an apocalyptic number.

It is an amenable number.

161784216 is an abundant number, since it is smaller than the sum of its proper divisors (332578224).

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

161784216 is a wasteful number, since it uses less digits than its factorization.

161784216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22726 (or 22713 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 161784216 is about 12719.4424406104. The cubic root of 161784216 is about 544.8940298411.

The spelling of 161784216 in words is "one hundred sixty-one million, seven hundred eighty-four thousand, two hundred sixteen".