161884620 has 144 divisors (see below), whose sum is σ = 511230720. Its totient is φ = 41430528.

The previous prime is 161884589. The next prime is 161884643. The reversal of 161884620 is 26488161.

161884620 is a `hidden beast` number, since 16 + 18 + 8 + 4 + 620 = 666.

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

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 725829 + ... + 726051.

Almost surely, 2^161884620 is an apocalyptic number.

161884620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161884620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255615360).

161884620 is an abundant number, since it is smaller than the sum of its proper divisors (349346100).

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

161884620 is a wasteful number, since it uses less digits than its factorization.

161884620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 161884620 is about 12723.3886995564. The cubic root of 161884620 is about 545.0067277457.

The spelling of 161884620 in words is "one hundred sixty-one million, eight hundred eighty-four thousand, six hundred twenty".