172281725 has 48 divisors (see below), whose sum is σ = 275030016. Its totient is φ = 103896000.

The previous prime is 172281701. The next prime is 172281727. The reversal of 172281725 is 527182271.

It is not a de Polignac number, because 172281725 - 2²⁶ = 105172861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172281727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58232 + ... + 61118.

It is an arithmetic number, because the mean of its divisors is an integer number (5729792).

Almost surely, 2^172281725 is an apocalyptic number.

It is an amenable number.

172281725 is a deficient number, since it is larger than the sum of its proper divisors (102748291).

172281725 is a wasteful number, since it uses less digits than its factorization.

172281725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946 (or 2941 counting only the distinct ones).

The product of its digits is 15680, while the sum is 35.

The square root of 172281725 is about 13125.6133190034. The cubic root of 172281725 is about 556.4332460271.

The spelling of 172281725 in words is "one hundred seventy-two million, two hundred eighty-one thousand, seven hundred twenty-five".