72172700 has 36 divisors (see below), whose sum is σ = 157255560. Its totient is φ = 28751040.

The previous prime is 72172693. The next prime is 72172717. The reversal of 72172700 is 727127.

It is a self number, because there is not a number n which added to its sum of digits gives 72172700.

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 11 ways as a sum of consecutive naturals, for example, 25559 + ... + 28241.

It is an arithmetic number, because the mean of its divisors is an integer number (4368210).

Almost surely, 2^72172700 is an apocalyptic number.

It is an amenable number.

72172700 is an abundant number, since it is smaller than the sum of its proper divisors (85082860).

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

72172700 is a wasteful number, since it uses less digits than its factorization.

72172700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966 (or 2959 counting only the distinct ones).

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

The square root of 72172700 is about 8495.4517243052. The cubic root of 72172700 is about 416.3491198329.

Adding to 72172700 its reverse (727127), we get a palindrome (72899827).

The spelling of 72172700 in words is "seventy-two million, one hundred seventy-two thousand, seven hundred".