72164438 has 8 divisors (see below), whose sum is σ = 109258632. Its totient is φ = 35744896.

The previous prime is 72164423. The next prime is 72164459. The reversal of 72164438 is 83446127.

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

It is a super-2 number, since 2×72164438² = 10415412223711688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72164398 and 72164407.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 168395 + ... + 168822.

It is an arithmetic number, because the mean of its divisors is an integer number (13657329).

Almost surely, 2^72164438 is an apocalyptic number.

72164438 is a deficient number, since it is larger than the sum of its proper divisors (37094194).

72164438 is a wasteful number, since it uses less digits than its factorization.

72164438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337326.

The product of its digits is 32256, while the sum is 35.

The square root of 72164438 is about 8494.9654501946. The cubic root of 72164438 is about 416.3332319801. Note that the first 3 decimals are identical.

It can be divided in two parts, 721644 and 38, that multiplied together give a palindrome (27422472).

The spelling of 72164438 in words is "seventy-two million, one hundred sixty-four thousand, four hundred thirty-eight".