172228516 has 6 divisors (see below), whose sum is σ = 301399910. Its totient is φ = 86114256.

The previous prime is 172228499. The next prime is 172228519. The reversal of 172228516 is 615822271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 90326016 + 81902500 = 9504^2 + 9050^2 .

It is not an unprimeable number, because it can be changed into a prime (172228519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21528561 + ... + 21528568.

Almost surely, 2^172228516 is an apocalyptic number.

It is an amenable number.

172228516 is a deficient number, since it is larger than the sum of its proper divisors (129171394).

172228516 is a wasteful number, since it uses less digits than its factorization.

172228516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43057133 (or 43057131 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 172228516 is about 13123.5862476687. The cubic root of 172228516 is about 556.3759555529.

The spelling of 172228516 in words is "one hundred seventy-two million, two hundred twenty-eight thousand, five hundred sixteen".