172861728 has 48 divisors (see below), whose sum is σ = 488670336. Its totient is φ = 53187840.

The previous prime is 172861727. The next prime is 172861751. The reversal of 172861728 is 827168271.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 172861728.

It is not an unprimeable number, because it can be changed into a prime (172861727) 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 7 ways as a sum of consecutive naturals, for example, 68008 + ... + 70503.

It is an arithmetic number, because the mean of its divisors is an integer number (10180632).

Almost surely, 2^172861728 is an apocalyptic number.

It is an amenable number.

172861728 is an abundant number, since it is smaller than the sum of its proper divisors (315808608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172861728 is a wasteful number, since it uses less digits than its factorization.

172861728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138537 (or 138529 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

The square root of 172861728 is about 13147.6890745104. The cubic root of 172861728 is about 557.0569752848.

The spelling of 172861728 in words is "one hundred seventy-two million, eight hundred sixty-one thousand, seven hundred twenty-eight".