161742740 has 12 divisors (see below), whose sum is σ = 339659796. Its totient is φ = 64697088.

The previous prime is 161742733. The next prime is 161742751. The reversal of 161742740 is 47247161.

161742740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64995844 + 96746896 = 8062^2 + 9836^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161742697 and 161742706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4043549 + ... + 4043588.

It is an arithmetic number, because the mean of its divisors is an integer number (28304983).

Almost surely, 2^161742740 is an apocalyptic number.

161742740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161742740 is an abundant number, since it is smaller than the sum of its proper divisors (177917056).

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

161742740 is a wasteful number, since it uses less digits than its factorization.

161742740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8087146 (or 8087144 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 161742740 is about 12717.8119187225. The cubic root of 161742740 is about 544.8474617294.

The spelling of 161742740 in words is "one hundred sixty-one million, seven hundred forty-two thousand, seven hundred forty".