649078217 has 8 divisors (see below), whose sum is σ = 676653312. Its totient is φ = 621918000.

The previous prime is 649078211. The next prime is 649078253. The reversal of 649078217 is 712870946.

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

It is a cyclic number.

It is not a de Polignac number, because 649078217 - 2⁴ = 649078201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649078211) 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, 100523 + ... + 106784.

It is an arithmetic number, because the mean of its divisors is an integer number (84581664).

Almost surely, 2^649078217 is an apocalyptic number.

It is an amenable number.

649078217 is a deficient number, since it is larger than the sum of its proper divisors (27575095).

649078217 is a wasteful number, since it uses less digits than its factorization.

649078217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207439.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 649078217 is about 25477.0135023711. The cubic root of 649078217 is about 865.8294324025.

The spelling of 649078217 in words is "six hundred forty-nine million, seventy-eight thousand, two hundred seventeen".