161773320 has 32 divisors (see below), whose sum is σ = 485320320. Its totient is φ = 43139520.

The previous prime is 161773307. The next prime is 161773321. The reversal of 161773320 is 23377161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161773321) 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, 673936 + ... + 674175.

It is an arithmetic number, because the mean of its divisors is an integer number (15166260).

Almost surely, 2^161773320 is an apocalyptic number.

161773320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161773320 is an abundant number, since it is smaller than the sum of its proper divisors (323547000).

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

161773320 is a wasteful number, since it uses less digits than its factorization.

161773320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348125 (or 1348121 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 161773320 is about 12719.0141127369. The cubic root of 161773320 is about 544.8817968829.

The spelling of 161773320 in words is "one hundred sixty-one million, seven hundred seventy-three thousand, three hundred twenty".