72172011 has 8 divisors (see below), whose sum is σ = 96932304. Its totient is φ = 47763200.

The previous prime is 72172003. The next prime is 72172031. The reversal of 72172011 is 11027127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72172011 - 2³ = 72172003 is a prime.

It is a super-3 number, since 3×72172011³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (72172031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87390 + ... + 88211.

It is an arithmetic number, because the mean of its divisors is an integer number (12116538).

Almost surely, 2^72172011 is an apocalyptic number.

72172011 is a deficient number, since it is larger than the sum of its proper divisors (24760293).

72172011 is a wasteful number, since it uses less digits than its factorization.

72172011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175741.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 72172011 is about 8495.4111730981. The cubic root of 72172011 is about 416.3477949300.

Adding to 72172011 its reverse (11027127), we get a palindrome (83199138).

The spelling of 72172011 in words is "seventy-two million, one hundred seventy-two thousand, eleven".