72171442 has 8 divisors (see below), whose sum is σ = 123722496. Its totient is φ = 30930612.

The previous prime is 72171413. The next prime is 72171457. The reversal of 72171442 is 24417127.

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

It is a self number, because there is not a number n which added to its sum of digits gives 72171442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2577538 + ... + 2577565.

It is an arithmetic number, because the mean of its divisors is an integer number (15465312).

Almost surely, 2^72171442 is an apocalyptic number.

72171442 is a deficient number, since it is larger than the sum of its proper divisors (51551054).

72171442 is a wasteful number, since it uses less digits than its factorization.

72171442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155112.

The product of its digits is 3136, while the sum is 28.

The square root of 72171442 is about 8495.3776843646. The cubic root of 72171442 is about 416.3467007731.

Adding to 72171442 its reverse (24417127), we get a palindrome (96588569).

The spelling of 72171442 in words is "seventy-two million, one hundred seventy-one thousand, four hundred forty-two".