82117470 has 32 divisors (see below), whose sum is σ = 197354880. Its totient is φ = 21867680.

The previous prime is 82117433. The next prime is 82117489. The reversal of 82117470 is 7471128.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27721 + ... + 30539.

It is an arithmetic number, because the mean of its divisors is an integer number (6167340).

Almost surely, 2^82117470 is an apocalyptic number.

82117470 is an abundant number, since it is smaller than the sum of its proper divisors (115237410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82117470 is a wasteful number, since it uses less digits than its factorization.

82117470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 82117470 is about 9061.8690125161. The cubic root of 82117470 is about 434.6555074115.

Adding to 82117470 its reverse (7471128), we get a palindrome (89588598).

The spelling of 82117470 in words is "eighty-two million, one hundred seventeen thousand, four hundred seventy".