649626 has 8 divisors (see below), whose sum is σ = 1299264. Its totient is φ = 216540.

The previous prime is 649619. The next prime is 649631. The reversal of 649626 is 626946.

649626 is nontrivially palindromic in base 8.

It is a sphenic number, since it is the product of 3 distinct primes.

649626 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 54130 + ... + 54141.

It is an arithmetic number, because the mean of its divisors is an integer number (162408).

2⁶⁴⁹⁶²⁶ is an apocalyptic number.

649626 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

649626 is a wasteful number, since it uses less digits than its factorization.

649626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108276.

The product of its digits is 15552, while the sum is 33.

The square root of 649626 is about 805.9937965022. The cubic root of 649626 is about 86.6072933248.

It can be divided in two parts, 649 and 626, that added together give a triangular number (1275 = T₅₀).

The spelling of 649626 in words is "six hundred forty-nine thousand, six hundred twenty-six".