161739036 has 72 divisors (see below), whose sum is σ = 428981280. Its totient is φ = 51283584.

The previous prime is 161739023. The next prime is 161739091. The reversal of 161739036 is 630937161.

161739036 is a `hidden beast` number, since 1 + 617 + 3 + 9 + 0 + 36 = 666.

161739036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189186 + ... + 190038.

Almost surely, 2^161739036 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 161739036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214490640).

161739036 is an abundant number, since it is smaller than the sum of its proper divisors (267242244).

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

161739036 is a wasteful number, since it uses less digits than its factorization.

161739036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 161739036 is about 12717.6662953547. Note that the first 3 decimals coincide. The cubic root of 161739036 is about 544.8433025929.

The spelling of 161739036 in words is "one hundred sixty-one million, seven hundred thirty-nine thousand, thirty-six".