161908736 has 48 divisors (see below), whose sum is σ = 353218320. Its totient is φ = 73584640.

The previous prime is 161908673. The next prime is 161908741. The reversal of 161908736 is 637809161.

It is a junction number, because it is equal to n+sod(n) for n = 161908693 and 161908702.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18935 + ... + 26121.

It is an arithmetic number, because the mean of its divisors is an integer number (7358715).

Almost surely, 2^161908736 is an apocalyptic number.

161908736 is a gapful number since it is divisible by the number (16) 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 161908736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176609160).

161908736 is an abundant number, since it is smaller than the sum of its proper divisors (191309584).

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

161908736 is an equidigital number, since it uses as much as digits as its factorization.

161908736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220 (or 7200 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 161908736 is about 12724.3363677639. The cubic root of 161908736 is about 545.0337896734.

The spelling of 161908736 in words is "one hundred sixty-one million, nine hundred eight thousand, seven hundred thirty-six".