865800080 has 40 divisors (see below), whose sum is σ = 2031473400. Its totient is φ = 343139328.

The previous prime is 865800049. The next prime is 865800101. The reversal of 865800080 is 80008568.

865800080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 437144464 + 428655616 = 20908^2 + 20704^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 865800080.

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, 40925 + ... + 58364.

It is an arithmetic number, because the mean of its divisors is an integer number (50786835).

Almost surely, 2^865800080 is an apocalyptic number.

865800080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865800080 is an abundant number, since it is smaller than the sum of its proper divisors (1165673320).

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

865800080 is a wasteful number, since it uses less digits than its factorization.

865800080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99411 (or 99405 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 865800080 is about 29424.4809639864. The cubic root of 865800080 is about 953.1016188549.

The spelling of 865800080 in words is "eight hundred sixty-five million, eight hundred thousand, eighty".