172344520 has 128 divisors (see below), whose sum is σ = 427472640. Its totient is φ = 62346240.

The previous prime is 172344509. The next prime is 172344533. The reversal of 172344520 is 25443271.

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 31 ways as a sum of consecutive naturals, for example, 2076399 + ... + 2076481.

It is an arithmetic number, because the mean of its divisors is an integer number (3339630).

Almost surely, 2^172344520 is an apocalyptic number.

172344520 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 172344520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213736320).

172344520 is an abundant number, since it is smaller than the sum of its proper divisors (255128120).

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

172344520 is a wasteful number, since it uses less digits than its factorization.

172344520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 172344520 is about 13128.0051797674. The cubic root of 172344520 is about 556.5008426363.

Adding to 172344520 its reverse (25443271), we get a palindrome (197787791).

The spelling of 172344520 in words is "one hundred seventy-two million, three hundred forty-four thousand, five hundred twenty".