72168438 has 8 divisors (see below), whose sum is σ = 144336888. Its totient is φ = 24056144.

The previous prime is 72168431. The next prime is 72168461. The reversal of 72168438 is 83486127.

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

72168438 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72168396 and 72168405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72168431) 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, 6014031 + ... + 6014042.

It is an arithmetic number, because the mean of its divisors is an integer number (18042111).

Almost surely, 2^72168438 is an apocalyptic number.

72168438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72168438 is a wasteful number, since it uses less digits than its factorization.

72168438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12028078.

The product of its digits is 64512, while the sum is 39.

The square root of 72168438 is about 8495.2008804972. The cubic root of 72168438 is about 416.3409241445.

The spelling of 72168438 in words is "seventy-two million, one hundred sixty-eight thousand, four hundred thirty-eight".