8918472640 has 224 divisors, whose sum is σ = 27630388224. Its totient is φ = 2658754560.

The previous prime is 8918472599. The next prime is 8918472653. The reversal of 8918472640 is 462748198.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558852 + ... + 574588.

Almost surely, 2^8918472640 is an apocalyptic number.

8918472640 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 8918472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13815194112).

8918472640 is an abundant number, since it is smaller than the sum of its proper divisors (18711915584).

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

8918472640 is a wasteful number, since it uses less digits than its factorization.

8918472640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15795 (or 15785 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 8918472640 is about 94437.6653671616. The cubic root of 8918472640 is about 2073.7838823542.

The spelling of 8918472640 in words is "eight billion, nine hundred eighteen million, four hundred seventy-two thousand, six hundred forty".