2815720840 has 64 divisors (see below), whose sum is σ = 6574296960. Its totient is φ = 1084554240.

The previous prime is 2815720819. The next prime is 2815720871. The reversal of 2815720840 is 480275182.

It is a self number, because there is not a number n which added to its sum of digits gives 2815720840.

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, 110592 + ... + 133648.

It is an arithmetic number, because the mean of its divisors is an integer number (102723390).

Almost surely, 2^2815720840 is an apocalyptic number.

2815720840 is a gapful number since it is divisible by the number (20) 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 2815720840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3287148480).

2815720840 is an abundant number, since it is smaller than the sum of its proper divisors (3758576120).

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

2815720840 is a wasteful number, since it uses less digits than its factorization.

2815720840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23182 (or 23178 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 2815720840 is about 53063.3662709029. The cubic root of 2815720840 is about 1412.0926691394.

The spelling of 2815720840 in words is "two billion, eight hundred fifteen million, seven hundred twenty thousand, eight hundred forty".