649738817 has 16 divisors (see below), whose sum is σ = 800282112. Its totient is φ = 513691200.

The previous prime is 649738811. The next prime is 649738847. The reversal of 649738817 is 718837946.

It is a cyclic number.

It is not a de Polignac number, because 649738817 - 2¹⁸ = 649476673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649738811) 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, 212423 + ... + 215459.

It is an arithmetic number, because the mean of its divisors is an integer number (50017632).

Almost surely, 2^649738817 is an apocalyptic number.

It is an amenable number.

649738817 is a deficient number, since it is larger than the sum of its proper divisors (150543295).

649738817 is a wasteful number, since it uses less digits than its factorization.

649738817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408.

The product of its digits is 2032128, while the sum is 53.

The square root of 649738817 is about 25489.9748332555. The cubic root of 649738817 is about 866.1230657314.

The spelling of 649738817 in words is "six hundred forty-nine million, seven hundred thirty-eight thousand, eight hundred seventeen".