161089680 has 80 divisors (see below), whose sum is σ = 510038784. Its totient is φ = 42040320.

The previous prime is 161089667. The next prime is 161089681. The reversal of 161089680 is 86980161.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (161089681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4140 + ... + 18420.

Almost surely, 2^161089680 is an apocalyptic number.

161089680 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 161089680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255019392).

161089680 is an abundant number, since it is smaller than the sum of its proper divisors (348949104).

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

161089680 is a wasteful number, since it uses less digits than its factorization.

161089680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14344 (or 14338 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 161089680 is about 12692.1109355379. The cubic root of 161089680 is about 544.1131721003.

The spelling of 161089680 in words is "one hundred sixty-one million, eighty-nine thousand, six hundred eighty".