2015820864 has 56 divisors (see below), whose sum is σ = 5926145120. Its totient is φ = 671939712.

The previous prime is 2015820841. The next prime is 2015820907. The reversal of 2015820864 is 4680285102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581554 + ... + 585009.

It is an arithmetic number, because the mean of its divisors is an integer number (105824020).

Almost surely, 2^2015820864 is an apocalyptic number.

2015820864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2015820864 is an abundant number, since it is smaller than the sum of its proper divisors (3910324256).

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

2015820864 is a wasteful number, since it uses less digits than its factorization.

2015820864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166584 (or 1166568 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 2015820864 is about 44897.8937590618. The cubic root of 2015820864 is about 1263.2345015118.

The spelling of 2015820864 in words is "two billion, fifteen million, eight hundred twenty thousand, eight hundred sixty-four".