866820540 has 96 divisors (see below), whose sum is σ = 2498840064. Its totient is φ = 224421120.

The previous prime is 866820533. The next prime is 866820551. The reversal of 866820540 is 45028668.

It is a congruent number.

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, 283902 + ... + 286938.

It is an arithmetic number, because the mean of its divisors is an integer number (26029584).

Almost surely, 2^866820540 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 866820540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249420032).

866820540 is an abundant number, since it is smaller than the sum of its proper divisors (1632019524).

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

866820540 is a wasteful number, since it uses less digits than its factorization.

866820540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187 (or 3185 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 866820540 is about 29441.8161803921. The cubic root of 866820540 is about 953.4759239772.

The spelling of 866820540 in words is "eight hundred sixty-six million, eight hundred twenty thousand, five hundred forty".