72215443 has 4 divisors (see below), whose sum is σ = 72878080. Its totient is φ = 71552808.

The previous prime is 72215441. The next prime is 72215459. The reversal of 72215443 is 34451227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72215443 - 2¹ = 72215441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72215441) 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, 331155 + ... + 331372.

It is an arithmetic number, because the mean of its divisors is an integer number (18219520).

Almost surely, 2^72215443 is an apocalyptic number.

72215443 is a deficient number, since it is larger than the sum of its proper divisors (662637).

72215443 is a wasteful number, since it uses less digits than its factorization.

72215443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662636.

The product of its digits is 6720, while the sum is 28.

The square root of 72215443 is about 8497.9669921694. The cubic root of 72215443 is about 416.4312954037.

The spelling of 72215443 in words is "seventy-two million, two hundred fifteen thousand, four hundred forty-three".