649131238 has 32 divisors (see below), whose sum is σ = 1175328000. Its totient is φ = 262665504.

The previous prime is 649131221. The next prime is 649131253. The reversal of 649131238 is 832131946.

It is a junction number, because it is equal to n+sod(n) for n = 649131197 and 649131206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77688 + ... + 85636.

It is an arithmetic number, because the mean of its divisors is an integer number (36729000).

Almost surely, 2^649131238 is an apocalyptic number.

649131238 is a deficient number, since it is larger than the sum of its proper divisors (526196762).

649131238 is a wasteful number, since it uses less digits than its factorization.

649131238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8284.

The product of its digits is 31104, while the sum is 37.

The square root of 649131238 is about 25478.0540465711. The cubic root of 649131238 is about 865.8530073180.

The spelling of 649131238 in words is "six hundred forty-nine million, one hundred thirty-one thousand, two hundred thirty-eight".