681802785 has 32 divisors (see below), whose sum is σ = 1227456000. Its totient is φ = 359019648.

The previous prime is 681802763. The next prime is 681802813. The reversal of 681802785 is 587208186.

It is not a de Polignac number, because 681802785 - 2⁷ = 681802657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 681802785.

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 31 ways as a sum of consecutive naturals, for example, 21300 + ... + 42629.

It is an arithmetic number, because the mean of its divisors is an integer number (38358000).

Almost surely, 2^681802785 is an apocalyptic number.

It is an amenable number.

681802785 is a deficient number, since it is larger than the sum of its proper divisors (545653215).

681802785 is a wasteful number, since it uses less digits than its factorization.

681802785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64022 (or 64016 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 681802785 is about 26111.3535650682. The cubic root of 681802785 is about 880.1423603192.

The spelling of 681802785 in words is "six hundred eighty-one million, eight hundred two thousand, seven hundred eighty-five".