172776225 has 24 divisors (see below), whose sum is σ = 286044192. Its totient is φ = 92022400.

The previous prime is 172776221. The next prime is 172776259. The reversal of 172776225 is 522677271.

It is not a de Polignac number, because 172776225 - 2² = 172776221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172776221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88510 + ... + 90440.

It is an arithmetic number, because the mean of its divisors is an integer number (11918508).

Almost surely, 2^172776225 is an apocalyptic number.

172776225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172776225 is a deficient number, since it is larger than the sum of its proper divisors (113267967).

172776225 is a wasteful number, since it uses less digits than its factorization.

172776225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3132 counting only the distinct ones).

The product of its digits is 82320, while the sum is 39.

The square root of 172776225 is about 13144.4370362523. The cubic root of 172776225 is about 556.9651140067.

The spelling of 172776225 in words is "one hundred seventy-two million, seven hundred seventy-six thousand, two hundred twenty-five".