172542720 has 288 divisors, whose sum is σ = 647539200. Its totient is φ = 39137280.

The previous prime is 172542697. The next prime is 172542737. The reversal of 172542720 is 27245271.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1317055 + ... + 1317185.

It is an arithmetic number, because the mean of its divisors is an integer number (2248400).

Almost surely, 2^172542720 is an apocalyptic number.

172542720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172542720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323769600).

172542720 is an abundant number, since it is smaller than the sum of its proper divisors (474996480).

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

172542720 is an equidigital number, since it uses as much as digits as its factorization.

172542720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 172542720 is about 13135.5517584912. The cubic root of 172542720 is about 556.7140903259.

Adding to 172542720 its reverse (27245271), we get a palindrome (199787991).

The spelling of 172542720 in words is "one hundred seventy-two million, five hundred forty-two thousand, seven hundred twenty".