8396809785 has 384 divisors, whose sum is σ = 20027520000. Its totient is φ = 3328625664.

The previous prime is 8396809781. The next prime is 8396809787. The reversal of 8396809785 is 5879086938.

8396809785 is a `hidden beast` number, since 8 + 396 + 80 + 97 + 85 = 666.

It is not a de Polignac number, because 8396809785 - 2² = 8396809781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8396809781) by changing a digit.

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 383 ways as a sum of consecutive naturals, for example, 226940787 + ... + 226940823.

It is an arithmetic number, because the mean of its divisors is an integer number (52155000).

Almost surely, 2^8396809785 is an apocalyptic number.

It is an amenable number.

8396809785 is an abundant number, since it is smaller than the sum of its proper divisors (11630710215).

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

8396809785 is a wasteful number, since it uses less digits than its factorization.

8396809785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The square root of 8396809785 is about 91634.1081966753. The cubic root of 8396809785 is about 2032.5353379567.

The spelling of 8396809785 in words is "eight billion, three hundred ninety-six million, eight hundred nine thousand, seven hundred eighty-five".