161706072 has 64 divisors (see below), whose sum is σ = 442483200. Its totient is φ = 48839040.

The previous prime is 161706053. The next prime is 161706073. The reversal of 161706072 is 270607161.

It is a happy number.

It is a super-2 number, since 2×161706072² = 52297707443338368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161706073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96054 + ... + 97722.

It is an arithmetic number, because the mean of its divisors is an integer number (6913800).

Almost surely, 2^161706072 is an apocalyptic number.

161706072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161706072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221241600).

161706072 is an abundant number, since it is smaller than the sum of its proper divisors (280777128).

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

161706072 is a wasteful number, since it uses less digits than its factorization.

161706072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 161706072 is about 12716.3702368247. The cubic root of 161706072 is about 544.8062852771.

The spelling of 161706072 in words is "one hundred sixty-one million, seven hundred six thousand, seventy-two".