664255800 has 144 divisors (see below), whose sum is σ = 2402476440. Its totient is φ = 163503360.

The previous prime is 664255793. The next prime is 664255849. The reversal of 664255800 is 8552466.

664255800 is a `hidden beast` number, since 6 + 642 + 5 + 5 + 8 + 0 + 0 = 666.

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 35 ways as a sum of consecutive naturals, for example, 9207 + ... + 37593.

Almost surely, 2^664255800 is an apocalyptic number.

664255800 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 664255800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201238220).

664255800 is an abundant number, since it is smaller than the sum of its proper divisors (1738220640).

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

664255800 is a wasteful number, since it uses less digits than its factorization.

664255800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28422 (or 28410 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 664255800 is about 25773.1604581200. The cubic root of 664255800 is about 872.5261497952.

The spelling of 664255800 in words is "six hundred sixty-four million, two hundred fifty-five thousand, eight hundred".