72156069 has 16 divisors (see below), whose sum is σ = 108003840. Its totient is φ = 47606400.

The previous prime is 72156067. The next prime is 72156079. The reversal of 72156069 is 96065127.

It is not a de Polignac number, because 72156069 - 2¹ = 72156067 is a prime.

It is a super-2 number, since 2×72156069² = 10412996587065522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72156067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11157 + ... + 16394.

It is an arithmetic number, because the mean of its divisors is an integer number (6750240).

Almost surely, 2^72156069 is an apocalyptic number.

It is an amenable number.

72156069 is a deficient number, since it is larger than the sum of its proper divisors (35847771).

72156069 is a wasteful number, since it uses less digits than its factorization.

72156069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27657 (or 27651 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 72156069 is about 8494.4728500361. The cubic root of 72156069 is about 416.3171371296.

The spelling of 72156069 in words is "seventy-two million, one hundred fifty-six thousand, sixty-nine".