8215395840 has 200 divisors, whose sum is σ = 29425694760. Its totient is φ = 2190716928.

The previous prime is 8215395821. The next prime is 8215395847. The reversal of 8215395840 is 485935128.

8215395840 is a `hidden beast` number, since 8 + 21 + 539 + 58 + 40 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8215395847) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 187551 + ... + 227169.

Almost surely, 2^8215395840 is an apocalyptic number.

8215395840 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 8215395840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14712847380).

8215395840 is an abundant number, since it is smaller than the sum of its proper divisors (21210298920).

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

8215395840 is an equidigital number, since it uses as much as digits as its factorization.

8215395840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39654 (or 39629 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 8215395840 is about 90638.8208219855. The cubic root of 8215395840 is about 2017.7909255563.

The spelling of 8215395840 in words is "eight billion, two hundred fifteen million, three hundred ninety-five thousand, eight hundred forty".