820878764 has 12 divisors (see below), whose sum is σ = 1436752800. Its totient is φ = 410377968.

The previous prime is 820878757. The next prime is 820878767. The reversal of 820878764 is 467878028.

It is not an unprimeable number, because it can be changed into a prime (820878767) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 28877 + ... + 49755.

It is an arithmetic number, because the mean of its divisors is an integer number (119729400).

Almost surely, 2^820878764 is an apocalyptic number.

It is an amenable number.

820878764 is a deficient number, since it is larger than the sum of its proper divisors (615874036).

820878764 is a wasteful number, since it uses less digits than its factorization.

820878764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30712 (or 30710 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 50.

The square root of 820878764 is about 28650.9819028947. The cubic root of 820878764 is about 936.3243984175.

The spelling of 820878764 in words is "eight hundred twenty million, eight hundred seventy-eight thousand, seven hundred sixty-four".