161276836 has 36 divisors (see below), whose sum is σ = 331369500. Its totient is φ = 68475456.

The previous prime is 161276833. The next prime is 161276861. The reversal of 161276836 is 638672161.

It is a happy number.

161276836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 124188736 + 37088100 = 11144^2 + 6090^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161276831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17590 + ... + 25138.

Almost surely, 2^161276836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161276836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165684750).

161276836 is an abundant number, since it is smaller than the sum of its proper divisors (170092664).

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

161276836 is a wasteful number, since it uses less digits than its factorization.

161276836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676 (or 7667 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 161276836 is about 12699.4817217082. The cubic root of 161276836 is about 544.3238097048.

The spelling of 161276836 in words is "one hundred sixty-one million, two hundred seventy-six thousand, eight hundred thirty-six".