82615217 has 4 divisors (see below), whose sum is σ = 85280256. Its totient is φ = 79950180.

The previous prime is 82615201. The next prime is 82615219. The reversal of 82615217 is 71251628.

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.

It is a cyclic number.

It is not a de Polignac number, because 82615217 - 2⁴ = 82615201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82615219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332473 + ... + 1332534.

It is an arithmetic number, because the mean of its divisors is an integer number (21320064).

Almost surely, 2^82615217 is an apocalyptic number.

It is an amenable number.

82615217 is a deficient number, since it is larger than the sum of its proper divisors (2665039).

82615217 is a wasteful number, since it uses less digits than its factorization.

82615217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665038.

The product of its digits is 6720, while the sum is 32.

The square root of 82615217 is about 9089.2913365124. The cubic root of 82615217 is about 435.5319462330.

The spelling of 82615217 in words is "eighty-two million, six hundred fifteen thousand, two hundred seventeen".