72171573 has 12 divisors (see below), whose sum is σ = 97901568. Its totient is φ = 47292040.

The previous prime is 72171563. The next prime is 72171611. The reversal of 72171573 is 37517127.

It is not a de Polignac number, because 72171573 - 2⁹ = 72171061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72171553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6988 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (8158464).

Almost surely, 2^72171573 is an apocalyptic number.

It is an amenable number.

72171573 is a deficient number, since it is larger than the sum of its proper divisors (25729995).

72171573 is an equidigital number, since it uses as much as digits as its factorization.

72171573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032 (or 6973 counting only the distinct ones).

The product of its digits is 10290, while the sum is 33.

The square root of 72171573 is about 8495.3853944362. The cubic root of 72171573 is about 416.3469526796.

The spelling of 72171573 in words is "seventy-two million, one hundred seventy-one thousand, five hundred seventy-three".