172243720 has 64 divisors (see below), whose sum is σ = 431827200. Its totient is φ = 61294080.

The previous prime is 172243717. The next prime is 172243723. The reversal of 172243720 is 27342271.

It is an interprime number because it is at equal distance from previous prime (172243717) and next prime (172243723).

It is not an unprimeable number, because it can be changed into a prime (172243723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16516 + ... + 24844.

It is an arithmetic number, because the mean of its divisors is an integer number (6747300).

Almost surely, 2^172243720 is an apocalyptic number.

172243720 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 172243720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215913600).

172243720 is an abundant number, since it is smaller than the sum of its proper divisors (259583480).

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

172243720 is a wasteful number, since it uses less digits than its factorization.

172243720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398 (or 8394 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 172243720 is about 13124.1654972802. The cubic root of 172243720 is about 556.3923270020.

Adding to 172243720 its reverse (27342271), we get a palindrome (199585991).

The spelling of 172243720 in words is "one hundred seventy-two million, two hundred forty-three thousand, seven hundred twenty".