7817782085 has 16 divisors (see below), whose sum is σ = 9878381760. Its totient is φ = 5923082880.

The previous prime is 7817782057. The next prime is 7817782117. The reversal of 7817782085 is 5802877187.

It is not a de Polignac number, because 7817782085 - 2¹⁴ = 7817765701 is a prime.

It is a super-2 number, since 2×7817782085² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314150 + ... + 338120.

It is an arithmetic number, because the mean of its divisors is an integer number (617398860).

Almost surely, 2^7817782085 is an apocalyptic number.

It is an amenable number.

7817782085 is a deficient number, since it is larger than the sum of its proper divisors (2060599675).

7817782085 is a wasteful number, since it uses less digits than its factorization.

7817782085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27428.

The product of its (nonzero) digits is 1756160, while the sum is 53.

The square root of 7817782085 is about 88418.2225844876. Note that the first 3 decimals coincide. The cubic root of 7817782085 is about 1984.6984028709.

The spelling of 7817782085 in words is "seven billion, eight hundred seventeen million, seven hundred eighty-two thousand, eighty-five".