161782530 has 128 divisors (see below), whose sum is σ = 503193600. Its totient is φ = 32327424.

The previous prime is 161782519. The next prime is 161782547. The reversal of 161782530 is 35287161.

161782530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161782491 and 161782500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50311 + ... + 53429.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^161782530 is an apocalyptic number.

161782530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161782530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251596800).

161782530 is an abundant number, since it is smaller than the sum of its proper divisors (341411070).

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

161782530 is a wasteful number, since it uses less digits than its factorization.

161782530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 161782530 is about 12719.3761639477. The cubic root of 161782530 is about 544.8921370019.

The spelling of 161782530 in words is "one hundred sixty-one million, seven hundred eighty-two thousand, five hundred thirty".