649473849 has 32 divisors (see below), whose sum is σ = 998553600. Its totient is φ = 416903760.

The previous prime is 649473841. The next prime is 649473859. The reversal of 649473849 is 948374946.

It is a happy number.

649473849 is a `hidden beast` number, since 6 + 494 + 73 + 84 + 9 = 666.

It is not a de Polignac number, because 649473849 - 2³ = 649473841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649473795 and 649473804.

It is not an unprimeable number, because it can be changed into a prime (649473841) 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 31 ways as a sum of consecutive naturals, for example, 78492 + ... + 86370.

It is an arithmetic number, because the mean of its divisors is an integer number (31204800).

Almost surely, 2^649473849 is an apocalyptic number.

It is an amenable number.

649473849 is a deficient number, since it is larger than the sum of its proper divisors (349079751).

649473849 is a wasteful number, since it uses less digits than its factorization.

649473849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8002 (or 7996 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 649473849 is about 25484.7768089108. The cubic root of 649473849 is about 866.0053127235.

The spelling of 649473849 in words is "six hundred forty-nine million, four hundred seventy-three thousand, eight hundred forty-nine".