868220928 has 138 divisors (see below), whose sum is σ = 2617245384. Its totient is φ = 276824064.

The previous prime is 868220909. The next prime is 868220953. The reversal of 868220928 is 829022868.

It is a tau number, because it is divible by the number of its divisors (138).

It is a zygodrome in base 2.

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, 37748725 + ... + 37748747.

Almost surely, 2^868220928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 868220928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308622692).

868220928 is an abundant number, since it is smaller than the sum of its proper divisors (1749024456).

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

868220928 is an frugal number, since it uses more digits than its factorization.

868220928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 868220928 is about 29465.5888792333. The cubic root of 868220928 is about 953.9891089563.

The spelling of 868220928 in words is "eight hundred sixty-eight million, two hundred twenty thousand, nine hundred twenty-eight".