649680558 has 32 divisors (see below), whose sum is σ = 1336242336. Its totient is φ = 210428928.

The previous prime is 649680541. The next prime is 649680569. The reversal of 649680558 is 855086946.

It is a super-3 number, since 3×649680558³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 649680558.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227910 + ... + 230742.

It is an arithmetic number, because the mean of its divisors is an integer number (41757573).

Almost surely, 2^649680558 is an apocalyptic number.

649680558 is an abundant number, since it is smaller than the sum of its proper divisors (686561778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649680558 is a wasteful number, since it uses less digits than its factorization.

649680558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 649680558 is about 25488.8320250262. The cubic root of 649680558 is about 866.0971779077.

The spelling of 649680558 in words is "six hundred forty-nine million, six hundred eighty thousand, five hundred fifty-eight".