820628878 has 8 divisors (see below), whose sum is σ = 1232571672. Its totient is φ = 409771656.

The previous prime is 820628873. The next prime is 820628911. The reversal of 820628878 is 878826028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820628873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269500 + ... + 272527.

It is an arithmetic number, because the mean of its divisors is an integer number (154071459).

Almost surely, 2^820628878 is an apocalyptic number.

820628878 is a deficient number, since it is larger than the sum of its proper divisors (411942794).

820628878 is a wasteful number, since it uses less digits than its factorization.

820628878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542786.

The product of its (nonzero) digits is 688128, while the sum is 49.

The square root of 820628878 is about 28646.6207082092. The cubic root of 820628878 is about 936.2293790656.

The spelling of 820628878 in words is "eight hundred twenty million, six hundred twenty-eight thousand, eight hundred seventy-eight".