806665860 has 576 divisors, whose sum is σ = 3402008064. Its totient is φ = 150543360.

The previous prime is 806665859. The next prime is 806665907. The reversal of 806665860 is 68566608.

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 191 ways as a sum of consecutive naturals, for example, 21801762 + ... + 21801798.

It is an arithmetic number, because the mean of its divisors is an integer number (5906264).

Almost surely, 2^806665860 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 806665860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701004032).

806665860 is an abundant number, since it is smaller than the sum of its proper divisors (2595342204).

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

806665860 is a wasteful number, since it uses less digits than its factorization.

806665860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 806665860 is about 28401.8636712452. The cubic root of 806665860 is about 930.8889869221. Note that the first 3 decimals are identical.

It can be divided in two parts, 806 and 665860, that added together give a palindrome (666666).

The spelling of 806665860 in words is "eight hundred six million, six hundred sixty-five thousand, eight hundred sixty".