72896321 has 4 divisors (see below), whose sum is σ = 72979392. Its totient is φ = 72813252.

The previous prime is 72896311. The next prime is 72896333. The reversal of 72896321 is 12369827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12369827 = 197 ⋅62791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72896321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72896311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40205 + ... + 41978.

It is an arithmetic number, because the mean of its divisors is an integer number (18244848).

Almost surely, 2^72896321 is an apocalyptic number.

It is an amenable number.

72896321 is a deficient number, since it is larger than the sum of its proper divisors (83071).

72896321 is an equidigital number, since it uses as much as digits as its factorization.

72896321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83070.

The product of its digits is 36288, while the sum is 38.

The square root of 72896321 is about 8537.9342349306. The cubic root of 72896321 is about 417.7359675796.

The spelling of 72896321 in words is "seventy-two million, eight hundred ninety-six thousand, three hundred twenty-one".