868391964 has 144 divisors (see below), whose sum is σ = 2495840256. Its totient is φ = 252201600.

The previous prime is 868391947. The next prime is 868391969. The reversal of 868391964 is 469193868.

It is a self number, because there is not a number n which added to its sum of digits gives 868391964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868391969) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1558774 + ... + 1559330.

It is an arithmetic number, because the mean of its divisors is an integer number (17332224).

Almost surely, 2^868391964 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 868391964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247920128).

868391964 is an abundant number, since it is smaller than the sum of its proper divisors (1627448292).

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

868391964 is a wasteful number, since it uses less digits than its factorization.

868391964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 731 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 868391964 is about 29468.4910370382. The cubic root of 868391964 is about 954.0517488377.

The spelling of 868391964 in words is "eight hundred sixty-eight million, three hundred ninety-one thousand, nine hundred sixty-four".