649947506 has 16 divisors (see below), whose sum is σ = 1055991384. Its totient is φ = 298239744.

The previous prime is 649947499. The next prime is 649947517. The reversal of 649947506 is 605749946.

It can be written as a sum of positive squares in 4 ways, for example, as 383964025 + 265983481 = 19595^2 + 16309^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 67751 + ... + 76746.

Almost surely, 2^649947506 is an apocalyptic number.

649947506 is a deficient number, since it is larger than the sum of its proper divisors (406043878).

649947506 is a wasteful number, since it uses less digits than its factorization.

649947506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144685.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 649947506 is about 25494.0680551378. The cubic root of 649947506 is about 866.2157855564.

The spelling of 649947506 in words is "six hundred forty-nine million, nine hundred forty-seven thousand, five hundred six".