649550 has 24 divisors (see below), whose sum is σ = 1319112. Its totient is φ = 236000.

The previous prime is 649541. The next prime is 649559. The reversal of 649550 is 55946.

It is an interprime number because it is at equal distance from previous prime (649541) and next prime (649559).

It is a Curzon number.

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 649550.

It is not an unprimeable number, because it can be changed into a prime (649559) by changing a digit.

649550 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 11 ways as a sum of consecutive naturals, for example, 41 + ... + 1140.

It is an arithmetic number, because the mean of its divisors is an integer number (54963).

649550 is a Friedman number, since it can be written as (6+5)*(9^5+4^0), using all its digits and the basic arithmetic operations.

2⁶⁴⁹⁵⁵⁰ is an apocalyptic number.

649550 is an abundant number, since it is smaller than the sum of its proper divisors (669562).

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

649550 is a wasteful number, since it uses less digits than its factorization.

649550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 649550 is about 805.9466483583. The cubic root of 649550 is about 86.6039157860.

The spelling of 649550 in words is "six hundred forty-nine thousand, five hundred fifty".