72143291 has 8 divisors (see below), whose sum is σ = 83331504. Its totient is φ = 61726720.

The previous prime is 72143287. The next prime is 72143299. The reversal of 72143291 is 19234127.

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

It is not a de Polignac number, because 72143291 - 2² = 72143287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72143299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192710 + ... + 193083.

It is an arithmetic number, because the mean of its divisors is an integer number (10416438).

Almost surely, 2^72143291 is an apocalyptic number.

72143291 is a deficient number, since it is larger than the sum of its proper divisors (11188213).

72143291 is a wasteful number, since it uses less digits than its factorization.

72143291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385821.

The product of its digits is 3024, while the sum is 29.

The square root of 72143291 is about 8493.7206805969. The cubic root of 72143291 is about 416.2925607057.

The spelling of 72143291 in words is "seventy-two million, one hundred forty-three thousand, two hundred ninety-one".