161289776 has 20 divisors (see below), whose sum is σ = 322580544. Its totient is φ = 78043200.

The previous prime is 161289773. The next prime is 161289781. The reversal of 161289776 is 677982161.

161289776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

161289776 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 161289776.

It is not an unprimeable number, because it can be changed into a prime (161289773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162095 + ... + 163086.

Almost surely, 2^161289776 is an apocalyptic number.

161289776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161289776 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161289776 is a wasteful number, since it uses less digits than its factorization.

161289776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325220 (or 325214 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 161289776 is about 12699.9911810993. The cubic root of 161289776 is about 544.3383672030.

The spelling of 161289776 in words is "one hundred sixty-one million, two hundred eighty-nine thousand, seven hundred seventy-six".