2015684864 has 72 divisors (see below), whose sum is σ = 4132477440. Its totient is φ = 980799488.

The previous prime is 2015684861. The next prime is 2015684887. The reversal of 2015684864 is 4684865102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2015684861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2803097 + ... + 2803815.

It is an arithmetic number, because the mean of its divisors is an integer number (57395520).

Almost surely, 2^2015684864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2015684864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2066238720).

2015684864 is an abundant number, since it is smaller than the sum of its proper divisors (2116792576).

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

2015684864 is an equidigital number, since it uses as much as digits as its factorization.

2015684864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1001 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 2015684864 is about 44896.3791858542. The cubic root of 2015684864 is about 1263.2060922818.

The spelling of 2015684864 in words is "two billion, fifteen million, six hundred eighty-four thousand, eight hundred sixty-four".