72129269 has 4 divisors (see below), whose sum is σ = 72697344. Its totient is φ = 71561196.

The previous prime is 72129259. The next prime is 72129271. The reversal of 72129269 is 96292127.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72129269 is a prime.

It is a super-2 number, since 2×72129269² = 10405262892948722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72129259) 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, 283847 + ... + 284100.

It is an arithmetic number, because the mean of its divisors is an integer number (18174336).

Almost surely, 2^72129269 is an apocalyptic number.

It is an amenable number.

72129269 is a deficient number, since it is larger than the sum of its proper divisors (568075).

72129269 is a wasteful number, since it uses less digits than its factorization.

72129269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568074.

The product of its digits is 27216, while the sum is 38.

The square root of 72129269 is about 8492.8952071717. The cubic root of 72129269 is about 416.2655883084.

The spelling of 72129269 in words is "seventy-two million, one hundred twenty-nine thousand, two hundred sixty-nine".