72173208 has 32 divisors (see below), whose sum is σ = 186255360. Its totient is φ = 23281440.

The previous prime is 72173203. The next prime is 72173209. The reversal of 72173208 is 80237127.

It is a super-2 number, since 2×72173208² = 10417943906022528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173203) by changing a digit.

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, 47760 + ... + 49247.

It is an arithmetic number, because the mean of its divisors is an integer number (5820480).

Almost surely, 2^72173208 is an apocalyptic number.

It is an amenable number.

72173208 is an abundant number, since it is smaller than the sum of its proper divisors (114082152).

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

72173208 is a wasteful number, since it uses less digits than its factorization.

72173208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97047 (or 97043 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 72173208 is about 8495.4816226039. The cubic root of 72173208 is about 416.3500966790.

The spelling of 72173208 in words is "seventy-two million, one hundred seventy-three thousand, two hundred eight".