649544 has 24 divisors (see below), whose sum is σ = 1417590. Its totient is φ = 278208.

The previous prime is 649541. The next prime is 649559. The reversal of 649544 is 445946.

649544 = 92² + 93² + ... + 139².

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 56644 = 770^2 + 238^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 649544.

It is not an unprimeable number, because it can be changed into a prime (649541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 437 + ... + 1220.

2⁶⁴⁹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

649544 is an abundant number, since it is smaller than the sum of its proper divisors (768046).

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

649544 is a wasteful number, since it uses less digits than its factorization.

649544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677 (or 1666 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 649544 is about 805.9429260190. The cubic root of 649544 is about 86.6036491270.

The spelling of 649544 in words is "six hundred forty-nine thousand, five hundred forty-four".