648776 has 8 divisors (see below), whose sum is σ = 1216470. Its totient is φ = 324384.

The previous prime is 648763. The next prime is 648779. The reversal of 648776 is 677846.

It can be written as a sum of positive squares in only one way, i.e., 372100 + 276676 = 610^2 + 526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (648779) by changing a digit.

648776 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40541 + ... + 40556.

2⁶⁴⁸⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

648776 is a deficient number, since it is larger than the sum of its proper divisors (567694).

648776 is a wasteful number, since it uses less digits than its factorization.

648776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81103 (or 81099 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 648776 is about 805.4663245599. The cubic root of 648776 is about 86.5695032064.

The spelling of 648776 in words is "six hundred forty-eight thousand, seven hundred seventy-six".