161228404 has 12 divisors (see below), whose sum is σ = 283170244. Its totient is φ = 80322624.

The previous prime is 161228401. The next prime is 161228411. The reversal of 161228404 is 404822161.

It can be written as a sum of positive squares in 2 ways, for example, as 51984100 + 109244304 = 7210^2 + 10452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161228401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71649 + ... + 73864.

Almost surely, 2^161228404 is an apocalyptic number.

It is an amenable number.

161228404 is a deficient number, since it is larger than the sum of its proper divisors (121941840).

161228404 is a wasteful number, since it uses less digits than its factorization.

161228404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145794 (or 145792 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 161228404 is about 12697.5747290575. The cubic root of 161228404 is about 544.2693167993.

The spelling of 161228404 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, four hundred four".