8691864240 has 80 divisors (see below), whose sum is σ = 26993058048. Its totient is φ = 2313677568.

The previous prime is 8691864229. The next prime is 8691864257. The reversal of 8691864240 is 424681968.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 8691864240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102957 + ... + 167283.

Almost surely, 2^8691864240 is an apocalyptic number.

8691864240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8691864240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13496529024).

8691864240 is an abundant number, since it is smaller than the sum of its proper divisors (18301193808).

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

8691864240 is a wasteful number, since it uses less digits than its factorization.

8691864240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64906 (or 64900 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 8691864240 is about 93230.1680787930. The cubic root of 8691864240 is about 2056.0688089837.

The spelling of 8691864240 in words is "eight billion, six hundred ninety-one million, eight hundred sixty-four thousand, two hundred forty".