866378616 has 64 divisors (see below), whose sum is σ = 2306361600. Its totient is φ = 270263808.

The previous prime is 866378603. The next prime is 866378641. The reversal of 866378616 is 616873668.

It is a happy number.

It is a super-2 number, since 2×866378616² = 1501223812524150912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67101 + ... + 78963.

It is an arithmetic number, because the mean of its divisors is an integer number (36036900).

Almost surely, 2^866378616 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 866378616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153180800).

866378616 is an abundant number, since it is smaller than the sum of its proper divisors (1439982984).

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

866378616 is a wasteful number, since it uses less digits than its factorization.

866378616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12068 (or 12064 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 866378616 is about 29434.3101838654. The cubic root of 866378616 is about 953.3138621656.

The spelling of 866378616 in words is "eight hundred sixty-six million, three hundred seventy-eight thousand, six hundred sixteen".