72180269 has 4 divisors (see below), whose sum is σ = 82491744. Its totient is φ = 61868796.

The previous prime is 72180247. The next prime is 72180281. The reversal of 72180269 is 96208127.

It is a happy number.

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: 96208127 = 1637 ⋅58771.

It is a cyclic number.

It is not a de Polignac number, because 72180269 - 2⁸ = 72180013 is a prime.

It is a super-2 number, since 2×72180269² = 10419982465824722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72180289) 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, 5155727 + ... + 5155740.

It is an arithmetic number, because the mean of its divisors is an integer number (20622936).

Almost surely, 2^72180269 is an apocalyptic number.

It is an amenable number.

72180269 is a deficient number, since it is larger than the sum of its proper divisors (10311475).

72180269 is a wasteful number, since it uses less digits than its factorization.

72180269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10311474.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 72180269 is about 8495.8971862894. The cubic root of 72180269 is about 416.3636739802.

The spelling of 72180269 in words is "seventy-two million, one hundred eighty thousand, two hundred sixty-nine".