8618783440 has 80 divisors (see below), whose sum is σ = 20238901056. Its totient is φ = 3413196800.

The previous prime is 8618783417. The next prime is 8618783447. The reversal of 8618783440 is 443878168.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8618783447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6717039 + ... + 6718321.

Almost surely, 2^8618783440 is an apocalyptic number.

8618783440 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 8618783440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10119450528).

8618783440 is an abundant number, since it is smaller than the sum of its proper divisors (11620117616).

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

8618783440 is a wasteful number, since it uses less digits than its factorization.

8618783440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068 (or 2062 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The square root of 8618783440 is about 92837.4032381346. The cubic root of 8618783440 is about 2050.2901385894.

The spelling of 8618783440 in words is "eight billion, six hundred eighteen million, seven hundred eighty-three thousand, four hundred forty".