868841644 has 24 divisors (see below), whose sum is σ = 1756269648. Its totient is φ = 371696640.

The previous prime is 868841641. The next prime is 868841651. The reversal of 868841644 is 446148868.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (868841641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580029 + ... + 581524.

It is an arithmetic number, because the mean of its divisors is an integer number (73177902).

Almost surely, 2^868841644 is an apocalyptic number.

It is an amenable number.

868841644 is an abundant number, since it is smaller than the sum of its proper divisors (887428004).

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

868841644 is a wasteful number, since it uses less digits than its factorization.

868841644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161585 (or 1161583 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 49.

The square root of 868841644 is about 29476.1198939073. The cubic root of 868841644 is about 954.2163995088.

The spelling of 868841644 in words is "eight hundred sixty-eight million, eight hundred forty-one thousand, six hundred forty-four".