664848 has 80 divisors (see below), whose sum is σ = 2033600. Its totient is φ = 209952.
The previous prime is 664847. The next prime is 664849. The reversal of 664848 is 848466.
664848 is a `hidden beast` number, since 6 + 648 + 4 + 8 = 666.
It is an interprime number because it is at equal distance from previous prime (664847) and next prime (664849).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
Its product of digits (36864) is a multiple of the sum of its prime divisors (24).
It is not an unprimeable number, because it can be changed into a prime (664843) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34983 + ... + 35001.
It is an arithmetic number, because the mean of its divisors is an integer number (25420).
664848 is a Friedman number, since it can be written as (6^4*(8+4^6))/8, using all its digits and the basic arithmetic operations.
2664848 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 664848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016800).
664848 is an abundant number, since it is smaller than the sum of its proper divisors (1368752).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
664848 is an equidigital number, since it uses as much as digits as its factorization.
664848 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 48 (or 24 counting only the distinct ones).
The product of its digits is 36864, while the sum is 36.
The square root of 664848 is about 815.3821190092. The cubic root of 664848 is about 87.2785365451.
The spelling of 664848 in words is "six hundred sixty-four thousand, eight hundred forty-eight".
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