865343880 has 96 divisors (see below), whose sum is σ = 2848060800. Its totient is φ = 227829888.

The previous prime is 865343867. The next prime is 865343893. The reversal of 865343880 is 88343568.

865343880 is a `hidden beast` number, since 8 + 6 + 534 + 38 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (865343867) and next prime (865343893).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13227 + ... + 43653.

It is an arithmetic number, because the mean of its divisors is an integer number (29667300).

Almost surely, 2^865343880 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 865343880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424030400).

865343880 is an abundant number, since it is smaller than the sum of its proper divisors (1982716920).

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

865343880 is a wasteful number, since it uses less digits than its factorization.

865343880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30523 (or 30516 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 865343880 is about 29416.7278941761. The cubic root of 865343880 is about 952.9341893837.

The spelling of 865343880 in words is "eight hundred sixty-five million, three hundred forty-three thousand, eight hundred eighty".