172231628 has 12 divisors (see below), whose sum is σ = 301739760. Its totient is φ = 86020272.

The previous prime is 172231621. The next prime is 172231639. The reversal of 172231628 is 826132271.

It is a junction number, because it is equal to n+sod(n) for n = 172231594 and 172231603.

It is not an unprimeable number, because it can be changed into a prime (172231621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19751 + ... + 27102.

It is an arithmetic number, because the mean of its divisors is an integer number (25144980).

Almost surely, 2^172231628 is an apocalyptic number.

It is an amenable number.

172231628 is a deficient number, since it is larger than the sum of its proper divisors (129508132).

172231628 is a wasteful number, since it uses less digits than its factorization.

172231628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47776 (or 47774 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 172231628 is about 13123.7048122853. The cubic root of 172231628 is about 556.3793065883.

Adding to 172231628 its reverse (826132271), we get a palindrome (998363899).

The spelling of 172231628 in words is "one hundred seventy-two million, two hundred thirty-one thousand, six hundred twenty-eight".