865676880 has 60 divisors (see below), whose sum is σ = 2907233940. Its totient is φ = 230846976.

The previous prime is 865676869. The next prime is 865676887. The reversal of 865676880 is 88676568.

It can be written as a sum of positive squares in 2 ways, for example, as 125619264 + 740057616 = 11208^2 + 27204^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865676887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 600445 + ... + 601884.

It is an arithmetic number, because the mean of its divisors is an integer number (48453899).

Almost surely, 2^865676880 is an apocalyptic number.

865676880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865676880 is an abundant number, since it is smaller than the sum of its proper divisors (2041557060).

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

865676880 is a wasteful number, since it uses less digits than its factorization.

865676880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202348 (or 1202339 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The square root of 865676880 is about 29422.3873946354. The cubic root of 865676880 is about 953.0564091534.

The spelling of 865676880 in words is "eight hundred sixty-five million, six hundred seventy-six thousand, eight hundred eighty".