865878260 has 144 divisors (see below), whose sum is σ = 2109038400. Its totient is φ = 297603072.

The previous prime is 865878197. The next prime is 865878283. The reversal of 865878260 is 62878568.

It is a super-2 number, since 2×865878260² = 1499490322281255200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 865878199 and 865878208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6229271 + ... + 6229409.

It is an arithmetic number, because the mean of its divisors is an integer number (14646100).

Almost surely, 2^865878260 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 865878260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054519200).

865878260 is an abundant number, since it is smaller than the sum of its proper divisors (1243160140).

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

865878260 is a wasteful number, since it uses less digits than its factorization.

865878260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The square root of 865878260 is about 29425.8094196234. The cubic root of 865878260 is about 953.1303057091.

The spelling of 865878260 in words is "eight hundred sixty-five million, eight hundred seventy-eight thousand, two hundred sixty".