172285305 has 32 divisors (see below), whose sum is σ = 284359680. Its totient is φ = 89019840.

The previous prime is 172285303. The next prime is 172285339. The reversal of 172285305 is 503582271.

It is not a de Polignac number, because 172285305 - 2¹ = 172285303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172285303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83476 + ... + 85514.

It is an arithmetic number, because the mean of its divisors is an integer number (8886240).

Almost surely, 2^172285305 is an apocalyptic number.

172285305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172285305 is a deficient number, since it is larger than the sum of its proper divisors (112074375).

172285305 is a wasteful number, since it uses less digits than its factorization.

172285305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 172285305 is about 13125.7496928747. The cubic root of 172285305 is about 556.4371002127.

The spelling of 172285305 in words is "one hundred seventy-two million, two hundred eighty-five thousand, three hundred five".