72324643 has 8 divisors (see below), whose sum is σ = 75385856. Its totient is φ = 69309000.

The previous prime is 72324631. The next prime is 72324653. The reversal of 72324643 is 34642327.

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 72324643 - 2¹⁷ = 72193571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72324653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8133 + ... + 14518.

It is an arithmetic number, because the mean of its divisors is an integer number (9423232).

Almost surely, 2^72324643 is an apocalyptic number.

72324643 is a deficient number, since it is larger than the sum of its proper divisors (3061213).

72324643 is a wasteful number, since it uses less digits than its factorization.

72324643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22785.

The product of its digits is 24192, while the sum is 31.

The square root of 72324643 is about 8504.3896312434. The cubic root of 72324643 is about 416.6410907679.

The spelling of 72324643 in words is "seventy-two million, three hundred twenty-four thousand, six hundred forty-three".