720172 has 6 divisors (see below), whose sum is σ = 1260308. Its totient is φ = 360084.

The previous prime is 720151. The next prime is 720173. The reversal of 720172 is 271027.

It is not an unprimeable number, because it can be changed into a prime (720173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90018 + ... + 90025.

2⁷²⁰¹⁷² is an apocalyptic number.

It is an amenable number.

720172 is a deficient number, since it is larger than the sum of its proper divisors (540136).

720172 is a wasteful number, since it uses less digits than its factorization.

720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180047 (or 180045 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 720172 is about 848.6294833436. The cubic root of 720172 is about 89.6352314149.

Adding to 720172 its reverse (271027), we get a palindrome (991199).

The spelling of 720172 in words is "seven hundred twenty thousand, one hundred seventy-two", and thus it is an iban number.