820769875 has 16 divisors (see below), whose sum is σ = 1025421696. Its totient is φ = 655910400.

The previous prime is 820769863. The next prime is 820769893. The reversal of 820769875 is 578967028.

It is a de Polignac number, because none of the positive numbers 2^k-820769875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134899 + ... + 140851.

It is an arithmetic number, because the mean of its divisors is an integer number (64088856).

Almost surely, 2^820769875 is an apocalyptic number.

820769875 is a deficient number, since it is larger than the sum of its proper divisors (204651821).

820769875 is a wasteful number, since it uses less digits than its factorization.

820769875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071 (or 7061 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 820769875 is about 28649.0815734117. The cubic root of 820769875 is about 936.2829956589.

The spelling of 820769875 in words is "eight hundred twenty million, seven hundred sixty-nine thousand, eight hundred seventy-five".