161730724 has 24 divisors (see below), whose sum is σ = 301606200. Its totient is φ = 75618816.

The previous prime is 161730643. The next prime is 161730727. The reversal of 161730724 is 427037161.

It can be written as a sum of positive squares in 4 ways, for example, as 42484324 + 119246400 = 6518^2 + 10920^2 .

It is not an unprimeable number, because it can be changed into a prime (161730727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3102 + ... + 18250.

It is an arithmetic number, because the mean of its divisors is an integer number (12566925).

Almost surely, 2^161730724 is an apocalyptic number.

It is an amenable number.

161730724 is a deficient number, since it is larger than the sum of its proper divisors (139875476).

161730724 is a wasteful number, since it uses less digits than its factorization.

161730724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15327 (or 15325 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 161730724 is about 12717.3395016411. The cubic root of 161730724 is about 544.8339690079.

Adding to 161730724 its reverse (427037161), we get a palindrome (588767885).

The spelling of 161730724 in words is "one hundred sixty-one million, seven hundred thirty thousand, seven hundred twenty-four".