72168869 has 2 divisors, whose sum is σ = 72168870. Its totient is φ = 72168868.

The previous prime is 72168857. The next prime is 72168913. The reversal of 72168869 is 96886127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 3844 = 8495^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 72168869 - 2¹² = 72164773 is a prime.

It is a super-2 number, since 2×72168869² = 10416691305478322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72168809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084434 + 36084435.

It is an arithmetic number, because the mean of its divisors is an integer number (36084435).

Almost surely, 2^72168869 is an apocalyptic number.

It is an amenable number.

72168869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72168869 is an equidigital number, since it uses as much as digits as its factorization.

72168869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 72168869 is about 8495.2262477229. The cubic root of 72168869 is about 416.3417529582.

It can be divided in two parts, 72168 and 869, that added together give a palindrome (73037).

The spelling of 72168869 in words is "seventy-two million, one hundred sixty-eight thousand, eight hundred sixty-nine".