172072520 has 32 divisors (see below), whose sum is σ = 387616320. Its totient is φ = 68748480.

The previous prime is 172072517. The next prime is 172072553. The reversal of 172072520 is 25270271.

It is a self number, because there is not a number n which added to its sum of digits gives 172072520.

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, 41669 + ... + 45611.

It is an arithmetic number, because the mean of its divisors is an integer number (12113010).

Almost surely, 2^172072520 is an apocalyptic number.

172072520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172072520 is an abundant number, since it is smaller than the sum of its proper divisors (215543800).

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

172072520 is a wasteful number, since it uses less digits than its factorization.

172072520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045 (or 5041 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 172072520 is about 13117.6415563164. The cubic root of 172072520 is about 556.2079256145.

The spelling of 172072520 in words is "one hundred seventy-two million, seventy-two thousand, five hundred twenty".