8147258640 has 100 divisors (see below), whose sum is σ = 28296658764. Its totient is φ = 2172600576.

The previous prime is 8147258621. The next prime is 8147258641. The reversal of 8147258640 is 468527418.

It can be written as a sum of positive squares in 2 ways, for example, as 5912994816 + 2234263824 = 76896^2 + 47268^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (8147258641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 622167 + ... + 635126.

Almost surely, 2^8147258640 is an apocalyptic number.

8147258640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8147258640 is an abundant number, since it is smaller than the sum of its proper divisors (20149400124).

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

8147258640 is a wasteful number, since it uses less digits than its factorization.

8147258640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257318 (or 1257303 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 8147258640 is about 90262.1661605792. The cubic root of 8147258640 is about 2012.1970184935.

The spelling of 8147258640 in words is "eight billion, one hundred forty-seven million, two hundred fifty-eight thousand, six hundred forty".