161636730 has 16 divisors (see below), whose sum is σ = 387928224. Its totient is φ = 43103120.

The previous prime is 161636729. The next prime is 161636777. The reversal of 161636730 is 37636161.

It is a super-2 number, since 2×161636730² = 52252864970185800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161636691 and 161636700.

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 7 ways as a sum of consecutive naturals, for example, 2693916 + ... + 2693975.

It is an arithmetic number, because the mean of its divisors is an integer number (24245514).

Almost surely, 2^161636730 is an apocalyptic number.

161636730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161636730 is an abundant number, since it is smaller than the sum of its proper divisors (226291494).

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

161636730 is a wasteful number, since it uses less digits than its factorization.

161636730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387901.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 161636730 is about 12713.6434588988. The cubic root of 161636730 is about 544.7284004288.

The spelling of 161636730 in words is "one hundred sixty-one million, six hundred thirty-six thousand, seven hundred thirty".