172438328 has 8 divisors (see below), whose sum is σ = 323321880. Its totient is φ = 86219160.

The previous prime is 172438307. The next prime is 172438367. The reversal of 172438328 is 823834271.

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 = 172438291 and 172438300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777388 + ... + 10777403.

It is an arithmetic number, because the mean of its divisors is an integer number (40415235).

Almost surely, 2^172438328 is an apocalyptic number.

It is an amenable number.

172438328 is a deficient number, since it is larger than the sum of its proper divisors (150883552).

172438328 is a wasteful number, since it uses less digits than its factorization.

172438328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21554797 (or 21554793 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 172438328 is about 13131.5775137643. The cubic root of 172438328 is about 556.6017930702.

The spelling of 172438328 in words is "one hundred seventy-two million, four hundred thirty-eight thousand, three hundred twenty-eight".