161780800 has 42 divisors (see below), whose sum is σ = 398085818. Its totient is φ = 64711680.

The previous prime is 161780797. The next prime is 161780809. The reversal of 161780800 is 8087161.

It can be written as a sum of positive squares in 3 ways, for example, as 1201216 + 160579584 = 1096^2 + 12672^2 .

It is not an unprimeable number, because it can be changed into a prime (161780809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48957 + ... + 52156.

Almost surely, 2^161780800 is an apocalyptic number.

161780800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161780800 is an abundant number, since it is smaller than the sum of its proper divisors (236305018).

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

161780800 is a wasteful number, since it uses less digits than its factorization.

161780800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101135 (or 101120 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 161780800 is about 12719.3081572859. The cubic root of 161780800 is about 544.8901947511.

The spelling of 161780800 in words is "one hundred sixty-one million, seven hundred eighty thousand, eight hundred".