72886321 has 2 divisors, whose sum is σ = 72886322. Its totient is φ = 72886320.

The previous prime is 72886273. The next prime is 72886343. The reversal of 72886321 is 12368827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 20830096 = 7215^2 + 4564^2 .

It is a cyclic number.

It is not a de Polignac number, because 72886321 - 2⁹ = 72885809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72886351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36443160 + 36443161.

It is an arithmetic number, because the mean of its divisors is an integer number (36443161).

Almost surely, 2^72886321 is an apocalyptic number.

It is an amenable number.

72886321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72886321 is an equidigital number, since it uses as much as digits as its factorization.

72886321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 72886321 is about 8537.3485930938. The cubic root of 72886321 is about 417.7168648748.

The spelling of 72886321 in words is "seventy-two million, eight hundred eighty-six thousand, three hundred twenty-one".