8257385640 has 64 divisors (see below), whose sum is σ = 28311039360. Its totient is φ = 1887402240.

The previous prime is 8257385627. The next prime is 8257385659. The reversal of 8257385640 is 465837528.

It is a self number, because there is not a number n which added to its sum of digits gives 8257385640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4914271 + ... + 4915950.

It is an arithmetic number, because the mean of its divisors is an integer number (442359990).

Almost surely, 2^8257385640 is an apocalyptic number.

It is an amenable number.

8257385640 is an abundant number, since it is smaller than the sum of its proper divisors (20053653720).

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

8257385640 is a wasteful number, since it uses less digits than its factorization.

8257385640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9830242 (or 9830238 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The square root of 8257385640 is about 90870.1581378617. The cubic root of 8257385640 is about 2021.2228030726. Note that the first 3 decimals are identical.

The spelling of 8257385640 in words is "eight billion, two hundred fifty-seven million, three hundred eighty-five thousand, six hundred forty".