161736380 has 72 divisors (see below), whose sum is σ = 372002400. Its totient is φ = 59035392.

The previous prime is 161736359. The next prime is 161736383. The reversal of 161736380 is 83637161.

It is a self number, because there is not a number n which added to its sum of digits gives 161736380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368201 + ... + 368639.

It is an arithmetic number, because the mean of its divisors is an integer number (5166700).

Almost surely, 2^161736380 is an apocalyptic number.

161736380 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 161736380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186001200).

161736380 is an abundant number, since it is smaller than the sum of its proper divisors (210266020).

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

161736380 is a wasteful number, since it uses less digits than its factorization.

161736380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 161736380 is about 12717.5618732523. The cubic root of 161736380 is about 544.8403201924.

The spelling of 161736380 in words is "one hundred sixty-one million, seven hundred thirty-six thousand, three hundred eighty".