72192173 has 4 divisors (see below), whose sum is σ = 72534528. Its totient is φ = 71849820.

The previous prime is 72192167. The next prime is 72192179. The reversal of 72192173 is 37129127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37129127 = 7 ⋅5304161.

It is an interprime number because it is at equal distance from previous prime (72192167) and next prime (72192179).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72192173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72192179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170861 + ... + 171282.

It is an arithmetic number, because the mean of its divisors is an integer number (18133632).

Almost surely, 2^72192173 is an apocalyptic number.

It is an amenable number.

72192173 is a deficient number, since it is larger than the sum of its proper divisors (342355).

72192173 is a wasteful number, since it uses less digits than its factorization.

72192173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342354.

The product of its digits is 5292, while the sum is 32.

The square root of 72192173 is about 8496.5977308567. The cubic root of 72192173 is about 416.3865616788.

The spelling of 72192173 in words is "seventy-two million, one hundred ninety-two thousand, one hundred seventy-three".