161628586 has 16 divisors (see below), whose sum is σ = 279195840. Its totient is φ = 68739840.

The previous prime is 161628569. The next prime is 161628647. The reversal of 161628586 is 685826161.

161628586 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161628586² = 52247599624718792, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 42231 + ... + 45898.

It is an arithmetic number, because the mean of its divisors is an integer number (17449740).

Almost surely, 2^161628586 is an apocalyptic number.

161628586 is a deficient number, since it is larger than the sum of its proper divisors (117567254).

161628586 is a wasteful number, since it uses less digits than its factorization.

161628586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88269.

The product of its digits is 138240, while the sum is 43.

The square root of 161628586 is about 12713.3231690223. The cubic root of 161628586 is about 544.7192516365.

The spelling of 161628586 in words is "one hundred sixty-one million, six hundred twenty-eight thousand, five hundred eighty-six".