72189605 has 8 divisors (see below), whose sum is σ = 87848064. Its totient is φ = 56938000.

The previous prime is 72189587. The next prime is 72189629. The reversal of 72189605 is 50698127.

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

It is not a de Polignac number, because 72189605 - 2⁶ = 72189541 is a prime.

It is a super-2 number, since 2×72189605² = 10422678140112050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101321 + ... + 102030.

It is an arithmetic number, because the mean of its divisors is an integer number (10981008).

Almost surely, 2^72189605 is an apocalyptic number.

It is an amenable number.

72189605 is a deficient number, since it is larger than the sum of its proper divisors (15658459).

72189605 is a wasteful number, since it uses less digits than its factorization.

72189605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203427.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 72189605 is about 8496.4466102012. The cubic root of 72189605 is about 416.3816244245.

The spelling of 72189605 in words is "seventy-two million, one hundred eighty-nine thousand, six hundred five".