649220 has 48 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 216960.

The previous prime is 649217. The next prime is 649261. The reversal of 649220 is 22946.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2747 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2⁶⁴⁹²²⁰ 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 649220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804384).

649220 is an abundant number, since it is smaller than the sum of its proper divisors (959548).

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

649220 is a wasteful number, since it uses less digits than its factorization.

649220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 649220 is about 805.7418941572. The cubic root of 649220 is about 86.5892471008.

The spelling of 649220 in words is "six hundred forty-nine thousand, two hundred twenty".