649919798 has 24 divisors (see below), whose sum is σ = 1079326920. Its totient is φ = 293292780.

The previous prime is 649919791. The next prime is 649919801. The reversal of 649919798 is 897919946.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 649919798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649919791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4675613 + ... + 4675751.

It is an arithmetic number, because the mean of its divisors is an integer number (44971955).

Almost surely, 2^649919798 is an apocalyptic number.

649919798 is a deficient number, since it is larger than the sum of its proper divisors (429407122).

649919798 is an frugal number, since it uses more digits than its factorization.

649919798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 152 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 62.

The square root of 649919798 is about 25493.5246288151. The cubic root of 649919798 is about 866.2034761274.

The spelling of 649919798 in words is "six hundred forty-nine million, nine hundred nineteen thousand, seven hundred ninety-eight".