868487220 has 36 divisors (see below), whose sum is σ = 2634411780. Its totient is φ = 231596544.

The previous prime is 868487219. The next prime is 868487233. The reversal of 868487220 is 22784868.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 298805796 + 569681424 = 17286^2 + 23868^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2412285 + ... + 2412644.

It is an arithmetic number, because the mean of its divisors is an integer number (73178105).

Almost surely, 2^868487220 is an apocalyptic number.

It is an amenable number.

868487220 is an abundant number, since it is smaller than the sum of its proper divisors (1765924560).

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

868487220 is a wasteful number, since it uses less digits than its factorization.

868487220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4824944 (or 4824939 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 868487220 is about 29470.1072274941. The cubic root of 868487220 is about 954.0866316381.

The spelling of 868487220 in words is "eight hundred sixty-eight million, four hundred eighty-seven thousand, two hundred twenty".