655866000 has 240 divisors, whose sum is σ = 2323601280. Its totient is φ = 172396800.

The previous prime is 655865963. The next prime is 655866011. The reversal of 655866000 is 668556.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1493781 + ... + 1494219.

It is an arithmetic number, because the mean of its divisors is an integer number (9681672).

Almost surely, 2^655866000 is an apocalyptic number.

655866000 is a gapful number since it is divisible by the number (60) 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 655866000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161800640).

655866000 is an abundant number, since it is smaller than the sum of its proper divisors (1667735280).

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

655866000 is a wasteful number, since it uses less digits than its factorization.

655866000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 655866000 is about 25609.8809056192. The cubic root of 655866000 is about 868.8371304705.

The spelling of 655866000 in words is "six hundred fifty-five million, eight hundred sixty-six thousand".