649018799 has 16 divisors (see below), whose sum is σ = 766348800. Its totient is φ = 541870560.

The previous prime is 649018793. The next prime is 649018801. The reversal of 649018799 is 997810946.

It is a happy number.

It is not a de Polignac number, because 649018799 - 2²⁰ = 647970223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649018799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649018793) 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, 17054 + ... + 39860.

It is an arithmetic number, because the mean of its divisors is an integer number (47896800).

Almost surely, 2^649018799 is an apocalyptic number.

649018799 is a deficient number, since it is larger than the sum of its proper divisors (117330001).

649018799 is a wasteful number, since it uses less digits than its factorization.

649018799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23030.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 649018799 is about 25475.8473656913. The cubic root of 649018799 is about 865.8030116406.

The spelling of 649018799 in words is "six hundred forty-nine million, eighteen thousand, seven hundred ninety-nine".