168720037 has 4 divisors (see below), whose sum is σ = 173280076. Its totient is φ = 164160000.

The previous prime is 168720029. The next prime is 168720049. The reversal of 168720037 is 730027861.

168720037 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102232321 + 66487716 = 10111^2 + 8154^2 .

It is a cyclic number.

It is not a de Polignac number, because 168720037 - 2³ = 168720029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168719984 and 168720011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168720017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279964 + ... + 2280037.

It is an arithmetic number, because the mean of its divisors is an integer number (43320019).

Almost surely, 2^168720037 is an apocalyptic number.

It is an amenable number.

168720037 is a deficient number, since it is larger than the sum of its proper divisors (4560039).

168720037 is an equidigital number, since it uses as much as digits as its factorization.

168720037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560038.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 168720037 is about 12989.2277291608. The cubic root of 168720037 is about 552.5720163013.

Adding to 168720037 its reverse (730027861), we get a palindrome (898747898).

The spelling of 168720037 in words is "one hundred sixty-eight million, seven hundred twenty thousand, thirty-seven".