649722 has 8 divisors (see below), whose sum is σ = 1299456. Its totient is φ = 216572.

The previous prime is 649717. The next prime is 649739. The reversal of 649722 is 227946.

It is a happy number.

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

649722 is an admirable number.

It is a d-powerful number, because it can be written as 6⁵ + 4⁹ + 7⁶ + 9 + 2¹⁷ + 2¹⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 649722.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649722.

It is an unprimeable number.

649722 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54138 + ... + 54149.

It is an arithmetic number, because the mean of its divisors is an integer number (162432).

2⁶⁴⁹⁷²² is an apocalyptic number.

649722 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.

649722 is a wasteful number, since it uses less digits than its factorization.

649722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108292.

The product of its digits is 6048, while the sum is 30.

The square root of 649722 is about 806.0533481104. The cubic root of 649722 is about 86.6115593130.

The spelling of 649722 in words is "six hundred forty-nine thousand, seven hundred twenty-two".