820855288 has 24 divisors (see below), whose sum is σ = 1691744040. Its totient is φ = 373115600.

The previous prime is 820855279. The next prime is 820855313. The reversal of 820855288 is 882558028.

820855288 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423028 + ... + 424963.

It is an arithmetic number, because the mean of its divisors is an integer number (70489335).

Almost surely, 2^820855288 is an apocalyptic number.

820855288 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

820855288 is an abundant number, since it is smaller than the sum of its proper divisors (870888752).

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

820855288 is a wasteful number, since it uses less digits than its factorization.

820855288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848019 (or 848004 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 46.

The square root of 820855288 is about 28650.5722106907. The cubic root of 820855288 is about 936.3154724704.

The spelling of 820855288 in words is "eight hundred twenty million, eight hundred fifty-five thousand, two hundred eighty-eight".