646760 has 64 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 228096.

The previous prime is 646757. The next prime is 646771. The reversal of 646760 is 67646.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable 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, 17462 + ... + 17498.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2⁶⁴⁶⁷⁶⁰ 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 646760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820800).

646760 is an abundant number, since it is smaller than the sum of its proper divisors (994840).

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

646760 is a wasteful number, since it uses less digits than its factorization.

646760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 646760 is about 804.2139018943. The cubic root of 646760 is about 86.4797417671.

The spelling of 646760 in words is "six hundred forty-six thousand, seven hundred sixty".