161608730 has 8 divisors (see below), whose sum is σ = 290895732. Its totient is φ = 64643488.

The previous prime is 161608723. The next prime is 161608747. The reversal of 161608730 is 37806161.

It can be written as a sum of positive squares in 2 ways, for example, as 157076089 + 4532641 = 12533^2 + 2129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161608730² = 52234763224425800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 8080427 + ... + 8080446.

Almost surely, 2^161608730 is an apocalyptic number.

161608730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161608730 is a deficient number, since it is larger than the sum of its proper divisors (129287002).

161608730 is a wasteful number, since it uses less digits than its factorization.

161608730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160880.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 161608730 is about 12712.5422319849. The cubic root of 161608730 is about 544.6969445503.

The spelling of 161608730 in words is "one hundred sixty-one million, six hundred eight thousand, seven hundred thirty".