866336400 has 180 divisors, whose sum is σ = 3137442048. Its totient is φ = 220957440.

The previous prime is 866336363. The next prime is 866336411. The reversal of 866336400 is 4633668.

866336400 is a `hidden beast` number, since 8 + 6 + 6 + 3 + 3 + 640 + 0 = 666.

866336400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 77569 + ... + 88031.

Almost surely, 2^866336400 is an apocalyptic number.

866336400 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 866336400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568721024).

866336400 is an abundant number, since it is smaller than the sum of its proper divisors (2271105648).

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

866336400 is a wasteful number, since it uses less digits than its factorization.

866336400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510 (or 10496 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 866336400 is about 29433.5930528368. The cubic root of 866336400 is about 953.2983778838.

The spelling of 866336400 in words is "eight hundred sixty-six million, three hundred thirty-six thousand, four hundred".