82415309 has 6 divisors (see below), whose sum is σ = 83597550. Its totient is φ = 81249560.

The previous prime is 82415237. The next prime is 82415323. The reversal of 82415309 is 90351428.

It can be written as a sum of positive squares in only one way, i.e., 57714409 + 24700900 = 7597^2 + 4970^2 .

It is not a de Polignac number, because 82415309 - 2¹² = 82411213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82411309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3134 + ... + 13215.

It is an arithmetic number, because the mean of its divisors is an integer number (13932925).

Almost surely, 2^82415309 is an apocalyptic number.

It is an amenable number.

82415309 is a deficient number, since it is larger than the sum of its proper divisors (1182241).

82415309 is an equidigital number, since it uses as much as digits as its factorization.

82415309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16491 (or 16420 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 82415309 is about 9078.2877790914. The cubic root of 82415309 is about 435.1803699971.

The spelling of 82415309 in words is "eighty-two million, four hundred fifteen thousand, three hundred nine".