172214720 has 56 divisors (see below), whose sum is σ = 411656784. Its totient is φ = 68622336.

The previous prime is 172214717. The next prime is 172214741. The reversal of 172214720 is 27412271.

It is a self number, because there is not a number n which added to its sum of digits gives 172214720.

It is a congruent number.

It is an unprimeable number.

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, 97364 + ... + 99116.

It is an arithmetic number, because the mean of its divisors is an integer number (7351014).

Almost surely, 2^172214720 is an apocalyptic number.

172214720 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 172214720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205828392).

172214720 is an abundant number, since it is smaller than the sum of its proper divisors (239442064).

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

172214720 is a wasteful number, since it uses less digits than its factorization.

172214720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077 (or 2067 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 172214720 is about 13123.0606186209. The cubic root of 172214720 is about 556.3610993843.

Adding to 172214720 its reverse (27412271), we get a palindrome (199626991).

The spelling of 172214720 in words is "one hundred seventy-two million, two hundred fourteen thousand, seven hundred twenty".