82728991 has 2 divisors, whose sum is σ = 82728992. Its totient is φ = 82728990.

The previous prime is 82728949. The next prime is 82729001. The reversal of 82728991 is 19982728.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82728991 - 2¹⁵ = 82696223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82728901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41364495 + 41364496.

It is an arithmetic number, because the mean of its divisors is an integer number (41364496).

Almost surely, 2^82728991 is an apocalyptic number.

82728991 is a deficient number, since it is larger than the sum of its proper divisors (1).

82728991 is an equidigital number, since it uses as much as digits as its factorization.

82728991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 82728991 is about 9095.5478669512. The cubic root of 82728991 is about 435.7317862617.

The spelling of 82728991 in words is "eighty-two million, seven hundred twenty-eight thousand, nine hundred ninety-one".