648713761 has 8 divisors (see below), whose sum is σ = 687112200. Its totient is φ = 610341888.

The previous prime is 648713759. The next prime is 648713777. The reversal of 648713761 is 167317846.

It can be written as a sum of positive squares in 4 ways, for example, as 425390625 + 223323136 = 20625^2 + 14944^2 .

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

It is not a de Polignac number, because 648713761 - 2¹ = 648713759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648713701) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 67165 + ... + 76213.

It is an arithmetic number, because the mean of its divisors is an integer number (85889025).

Almost surely, 2^648713761 is an apocalyptic number.

It is an amenable number.

648713761 is a deficient number, since it is larger than the sum of its proper divisors (38398439).

648713761 is a wasteful number, since it uses less digits than its factorization.

648713761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13283.

The product of its digits is 169344, while the sum is 43.

The square root of 648713761 is about 25469.8598543455. The cubic root of 648713761 is about 865.6673482842.

The spelling of 648713761 in words is "six hundred forty-eight million, seven hundred thirteen thousand, seven hundred sixty-one".