161285436 has 72 divisors (see below), whose sum is σ = 453258624. Its totient is φ = 48021120.

The previous prime is 161285429. The next prime is 161285437. The reversal of 161285436 is 634582161.

It is a happy number.

161285436 is a `hidden beast` number, since 1 + 612 + 8 + 5 + 4 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161285436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161285437) 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 23 ways as a sum of consecutive naturals, for example, 8950 + ... + 20066.

Almost surely, 2^161285436 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 161285436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226629312).

161285436 is an abundant number, since it is smaller than the sum of its proper divisors (291973188).

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

161285436 is a wasteful number, since it uses less digits than its factorization.

161285436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11171 (or 11166 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161285436 is about 12699.8203136895. The cubic root of 161285436 is about 544.3334847904. Note that the first 3 decimals are identical.

The spelling of 161285436 in words is "one hundred sixty-one million, two hundred eighty-five thousand, four hundred thirty-six".