648660 has 48 divisors (see below), whose sum is σ = 1915200. Its totient is φ = 163584.

The previous prime is 648653. The next prime is 648671. The reversal of 648660 is 66846.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

648660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856 + ... + 1424.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁶⁴⁸⁶⁶⁰ is an apocalyptic number.

648660 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 648660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957600).

648660 is an abundant number, since it is smaller than the sum of its proper divisors (1266540).

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

648660 is a wasteful number, since it uses less digits than its factorization.

648660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 648660 is about 805.3943133646. The cubic root of 648660 is about 86.5643434076.

The spelling of 648660 in words is "six hundred forty-eight thousand, six hundred sixty".