649660 has 24 divisors (see below), whose sum is σ = 1488816. Its totient is φ = 236160.

The previous prime is 649657. The next prime is 649661. The reversal of 649660 is 66946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257 + ... + 1696.

It is an arithmetic number, because the mean of its divisors is an integer number (62034).

2⁶⁴⁹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

649660 is an abundant number, since it is smaller than the sum of its proper divisors (839156).

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

649660 is a wasteful number, since it uses less digits than its factorization.

649660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973 (or 2971 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 649660 is about 806.0148882000. The cubic root of 649660 is about 86.6088042437.

It can be divided in two parts, 6496 and 60, that added together give a palindrome (6556).

The spelling of 649660 in words is "six hundred forty-nine thousand, six hundred sixty".