161738136 has 192 divisors, whose sum is σ = 543628800. Its totient is φ = 42384384.

The previous prime is 161738131. The next prime is 161738147. The reversal of 161738136 is 631837161.

161738136 is a `hidden beast` number, since 1 + 617 + 3 + 8 + 1 + 36 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 161738136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161738131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 368205 + ... + 368643.

It is an arithmetic number, because the mean of its divisors is an integer number (2831400).

Almost surely, 2^161738136 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 161738136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271814400).

161738136 is an abundant number, since it is smaller than the sum of its proper divisors (381890664).

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

161738136 is a wasteful number, since it uses less digits than its factorization.

161738136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 511 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 161738136 is about 12717.6309114552. The cubic root of 161738136 is about 544.8422919939.

The spelling of 161738136 in words is "one hundred sixty-one million, seven hundred thirty-eight thousand, one hundred thirty-six".