649432789 has 4 divisors (see below), whose sum is σ = 649940256. Its totient is φ = 648925324.

The previous prime is 649432783. The next prime is 649432799. The reversal of 649432789 is 987234946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649432789 - 2³ = 649432781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649432781) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 251809 + ... + 254374.

It is an arithmetic number, because the mean of its divisors is an integer number (162485064).

Almost surely, 2^649432789 is an apocalyptic number.

It is an amenable number.

649432789 is a deficient number, since it is larger than the sum of its proper divisors (507467).

649432789 is a wasteful number, since it uses less digits than its factorization.

649432789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507466.

The product of its digits is 2612736, while the sum is 52.

The square root of 649432789 is about 25483.9712172181. The cubic root of 649432789 is about 865.9870626033.

The spelling of 649432789 in words is "six hundred forty-nine million, four hundred thirty-two thousand, seven hundred eighty-nine".