161772300 has 108 divisors (see below), whose sum is σ = 510488160. Its totient is φ = 42848640.

The previous prime is 161772287. The next prime is 161772301. The reversal of 161772300 is 3277161.

It is not an unprimeable number, because it can be changed into a prime (161772301) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 155181 + ... + 156219.

Almost surely, 2^161772300 is an apocalyptic number.

161772300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161772300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255244080).

161772300 is an abundant number, since it is smaller than the sum of its proper divisors (348715860).

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

161772300 is a wasteful number, since it uses less digits than its factorization.

161772300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 161772300 is about 12718.9740152262. The cubic root of 161772300 is about 544.8806516991.

The spelling of 161772300 in words is "one hundred sixty-one million, seven hundred seventy-two thousand, three hundred".