82428509 has 2 divisors, whose sum is σ = 82428510. Its totient is φ = 82428508.

The previous prime is 82428503. The next prime is 82428539. The reversal of 82428509 is 90582428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49308484 + 33120025 = 7022^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 82428509 - 2⁸ = 82428253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82428503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41214254 + 41214255.

It is an arithmetic number, because the mean of its divisors is an integer number (41214255).

Almost surely, 2^82428509 is an apocalyptic number.

It is an amenable number.

82428509 is a deficient number, since it is larger than the sum of its proper divisors (1).

82428509 is an equidigital number, since it uses as much as digits as its factorization.

82428509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 82428509 is about 9079.0147593227. The cubic root of 82428509 is about 435.2036022271.

The spelling of 82428509 in words is "eighty-two million, four hundred twenty-eight thousand, five hundred nine".