649587257 has 16 divisors (see below), whose sum is σ = 753347520. Its totient is φ = 553896000.

The previous prime is 649587233. The next prime is 649587259. The reversal of 649587257 is 752785946.

It is a cyclic number.

It is not a de Polignac number, because 649587257 - 2¹⁰ = 649586233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649587199 and 649587208.

It is not an unprimeable number, because it can be changed into a prime (649587259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5723 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (47084220).

Almost surely, 2^649587257 is an apocalyptic number.

It is an amenable number.

649587257 is a deficient number, since it is larger than the sum of its proper divisors (103760263).

649587257 is a wasteful number, since it uses less digits than its factorization.

649587257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30904.

The product of its digits is 4233600, while the sum is 53.

The square root of 649587257 is about 25487.0017263702. The cubic root of 649587257 is about 866.0557156842.

The spelling of 649587257 in words is "six hundred forty-nine million, five hundred eighty-seven thousand, two hundred fifty-seven".