665280000 has 800 divisors, whose sum is σ = 3068017920. Its totient is φ = 138240000.

The previous prime is 665279999. The next prime is 665280019. The reversal of 665280000 is 82566.

665280000 is a `hidden beast` number, since 6 + 652 + 8 + 0 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (800).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 60479995 + ... + 60480005.

Almost surely, 2^665280000 is an apocalyptic number.

665280000 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 665280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534008960).

665280000 is an abundant number, since it is smaller than the sum of its proper divisors (2402737920).

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

665280000 is an equidigital number, since it uses as much as digits as its factorization.

665280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 665280000 is about 25793.0223122456. The cubic root of 665280000 is about 872.9743618550.

The spelling of 665280000 in words is "six hundred sixty-five million, two hundred eighty thousand".