172344728 has 8 divisors (see below), whose sum is σ = 323146380. Its totient is φ = 86172360.

The previous prime is 172344721. The next prime is 172344743. The reversal of 172344728 is 827443271.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 172344691 and 172344700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172344721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10771538 + ... + 10771553.

Almost surely, 2^172344728 is an apocalyptic number.

It is an amenable number.

172344728 is a deficient number, since it is larger than the sum of its proper divisors (150801652).

172344728 is a wasteful number, since it uses less digits than its factorization.

172344728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21543097 (or 21543093 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 172344728 is about 13128.0131017607. The cubic root of 172344728 is about 556.5010665137.

Adding to 172344728 its reverse (827443271), we get a palindrome (999787999).

The spelling of 172344728 in words is "one hundred seventy-two million, three hundred forty-four thousand, seven hundred twenty-eight".