8640869940 has 144 divisors (see below), whose sum is σ = 27779532480. Its totient is φ = 2229768000.

The previous prime is 8640869929. The next prime is 8640869947. The reversal of 8640869940 is 499680468.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640869947) 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, 510615 + ... + 527265.

It is an arithmetic number, because the mean of its divisors is an integer number (192913420).

Almost surely, 2^8640869940 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 8640869940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13889766240).

8640869940 is an abundant number, since it is smaller than the sum of its proper divisors (19138662540).

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

8640869940 is a wasteful number, since it uses less digits than its factorization.

8640869940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16731 (or 16692 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 8640869940 is about 92956.2797233194. The cubic root of 8640869940 is about 2052.0400029820.

The spelling of 8640869940 in words is "eight billion, six hundred forty million, eight hundred sixty-nine thousand, nine hundred forty".