8478631540 has 48 divisors (see below), whose sum is σ = 18172622160. Its totient is φ = 3321676800.

The previous prime is 8478631517. The next prime is 8478631541. The reversal of 8478631540 is 451368748.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 119552356 + 8359079184 = 10934^2 + 91428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8478631541) 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, 630406 + ... + 643714.

It is an arithmetic number, because the mean of its divisors is an integer number (378596295).

Almost surely, 2^8478631540 is an apocalyptic number.

It is an amenable number.

8478631540 is an abundant number, since it is smaller than the sum of its proper divisors (9693990620).

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

8478631540 is a wasteful number, since it uses less digits than its factorization.

8478631540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13972 (or 13970 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 8478631540 is about 92079.4849029902. The cubic root of 8478631540 is about 2039.1159455972.

The spelling of 8478631540 in words is "eight billion, four hundred seventy-eight million, six hundred thirty-one thousand, five hundred forty".