172720700 has 72 divisors (see below), whose sum is σ = 388620960. Its totient is φ = 66585600.

The previous prime is 172720679. The next prime is 172720703. The reversal of 172720700 is 7027271.

It is a self number, because there is not a number n which added to its sum of digits gives 172720700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172720703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 422096 + ... + 422504.

Almost surely, 2^172720700 is an apocalyptic number.

172720700 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 172720700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194310480).

172720700 is an abundant number, since it is smaller than the sum of its proper divisors (215900260).

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

172720700 is a wasteful number, since it uses less digits than its factorization.

172720700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 172720700 is about 13142.3247562979. The cubic root of 172720700 is about 556.9054437571.

Adding to 172720700 its reverse (7027271), we get a palindrome (179747971).

The spelling of 172720700 in words is "one hundred seventy-two million, seven hundred twenty thousand, seven hundred".