649044 has 54 divisors (see below), whose sum is σ = 1815450. Its totient is φ = 195360.

The previous prime is 649039. The next prime is 649063. The reversal of 649044 is 440946.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 213444 = 660^2 + 462^2 .

It is a super-2 number, since 2×649044² = 842516227872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648999 and 649017.

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 17 ways as a sum of consecutive naturals, for example, 4282 + ... + 4430.

2⁶⁴⁹⁰⁴⁴ 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 649044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907725).

649044 is an abundant number, since it is smaller than the sum of its proper divisors (1166406).

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

649044 is a wasteful number, since it uses less digits than its factorization.

649044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 649044 is about 805.6326706384. The cubic root of 649044 is about 86.5814217695.

The spelling of 649044 in words is "six hundred forty-nine thousand, forty-four".