648769 has 4 divisors (see below), whose sum is σ = 707760. Its totient is φ = 589780.

The previous prime is 648763. The next prime is 648779. The reversal of 648769 is 967846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648769 - 2⁹ = 648257 is a prime.

It is a super-2 number, since 2×648769² = 841802430722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29479 + ... + 29500.

It is an arithmetic number, because the mean of its divisors is an integer number (176940).

2⁶⁴⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

648769 is a deficient number, since it is larger than the sum of its proper divisors (58991).

648769 is a wasteful number, since it uses less digits than its factorization.

648769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58990.

The product of its digits is 72576, while the sum is 40.

The square root of 648769 is about 805.4619792392. The cubic root of 648769 is about 86.5691918567.

It can be divided in two parts, 6487 and 69, that added together give a palindrome (6556).

The spelling of 648769 in words is "six hundred forty-eight thousand, seven hundred sixty-nine".