161764730 has 16 divisors (see below), whose sum is σ = 291630240. Its totient is φ = 64605072.

The previous prime is 161764723. The next prime is 161764739. The reversal of 161764730 is 37467161.

161764730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161764739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5684 + ... + 18863.

It is an arithmetic number, because the mean of its divisors is an integer number (18226890).

Almost surely, 2^161764730 is an apocalyptic number.

161764730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161764730 is a deficient number, since it is larger than the sum of its proper divisors (129865510).

161764730 is a wasteful number, since it uses less digits than its factorization.

161764730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25213.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 161764730 is about 12718.6764248486. The cubic root of 161764730 is about 544.8721524878.

The spelling of 161764730 in words is "one hundred sixty-one million, seven hundred sixty-four thousand, seven hundred thirty".