866171040 has 192 divisors, whose sum is σ = 3182457600. Its totient is φ = 197944320.

The previous prime is 866171039. The next prime is 866171087. The reversal of 866171040 is 40171668.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 866170992 and 866171010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162010 + ... + 167270.

It is an arithmetic number, because the mean of its divisors is an integer number (16575300).

Almost surely, 2^866171040 is an apocalyptic number.

866171040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866171040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591228800).

866171040 is an abundant number, since it is smaller than the sum of its proper divisors (2316286560).

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

866171040 is a wasteful number, since it uses less digits than its factorization.

866171040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300 (or 5278 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 866171040 is about 29430.7838835462. The cubic root of 866171040 is about 953.2377211342.

The spelling of 866171040 in words is "eight hundred sixty-six million, one hundred seventy-one thousand, forty".