2865859820 has 24 divisors (see below), whose sum is σ = 6165095328. Its totient is φ = 1118384000.

The previous prime is 2865859819. The next prime is 2865859877. The reversal of 2865859820 is 289585682.

It is a happy number.

2865859820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1746656 + ... + 1748295.

It is an arithmetic number, because the mean of its divisors is an integer number (256878972).

Almost surely, 2^2865859820 is an apocalyptic number.

2865859820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2865859820 is an abundant number, since it is smaller than the sum of its proper divisors (3299235508).

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

2865859820 is a wasteful number, since it uses less digits than its factorization.

2865859820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495001 (or 3494999 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 53.

The square root of 2865859820 is about 53533.7260052016. The cubic root of 2865859820 is about 1420.4250232058.

The spelling of 2865859820 in words is "two billion, eight hundred sixty-five million, eight hundred fifty-nine thousand, eight hundred twenty".