648765 has 24 divisors (see below), whose sum is σ = 1212120. Its totient is φ = 319104.

The previous prime is 648763. The next prime is 648779. The reversal of 648765 is 567846.

It is a happy number.

648765 is a `hidden beast` number, since 648 + 7 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26244 + 622521 = 162^2 + 789^2 .

It is not a de Polignac number, because 648765 - 2¹ = 648763 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648765.

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 23 ways as a sum of consecutive naturals, for example, 31 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (50505).

2⁶⁴⁸⁷⁶⁵ is an apocalyptic number.

648765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

648765 is a deficient number, since it is larger than the sum of its proper divisors (563355).

648765 is a wasteful number, since it uses less digits than its factorization.

648765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1130 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 648765 is about 805.4594961884. The cubic root of 648765 is about 86.5690139415.

The spelling of 648765 in words is "six hundred forty-eight thousand, seven hundred sixty-five".