8538286640 has 40 divisors (see below), whose sum is σ = 21378558768. Its totient is φ = 3152597760.

The previous prime is 8538286639. The next prime is 8538286643. The reversal of 8538286640 is 466828358.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (8538286643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4103906 + ... + 4105985.

Almost surely, 2^8538286640 is an apocalyptic number.

8538286640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8538286640 is an abundant number, since it is smaller than the sum of its proper divisors (12840272128).

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

8538286640 is a wasteful number, since it uses less digits than its factorization.

8538286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8209917 (or 8209911 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 50.

The square root of 8538286640 is about 92402.8497396049. The cubic root of 8538286640 is about 2043.8871354890.

The spelling of 8538286640 in words is "eight billion, five hundred thirty-eight million, two hundred eighty-six thousand, six hundred forty".