72216491 has 8 divisors (see below), whose sum is σ = 73418064. Its totient is φ = 71020800.

The previous prime is 72216449. The next prime is 72216499. The reversal of 72216491 is 19461227.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72216491 - 2¹⁰ = 72215467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72216499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28040 + ... + 30506.

It is an arithmetic number, because the mean of its divisors is an integer number (9177258).

Almost surely, 2^72216491 is an apocalyptic number.

72216491 is a deficient number, since it is larger than the sum of its proper divisors (1201573).

72216491 is a wasteful number, since it uses less digits than its factorization.

With its successor (72216492) it forms an eRAP, since the sums of their prime factors are consecutive (2941 and 2942).

72216491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941.

The product of its digits is 6048, while the sum is 32.

The square root of 72216491 is about 8498.0286537526. The cubic root of 72216491 is about 416.4333098292.

The spelling of 72216491 in words is "seventy-two million, two hundred sixteen thousand, four hundred ninety-one".