649133838 has 40 divisors (see below), whose sum is σ = 1456768368. Its totient is φ = 216046656.

The previous prime is 649133833. The next prime is 649133839. The reversal of 649133838 is 838331946.

It is a super-2 number, since 2×649133838² = 842749479273220488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 649133793 and 649133802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649133833) 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 19 ways as a sum of consecutive naturals, for example, 117670 + ... + 123062.

Almost surely, 2^649133838 is an apocalyptic number.

649133838 is an abundant number, since it is smaller than the sum of its proper divisors (807634530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649133838 is a wasteful number, since it uses less digits than its factorization.

649133838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6150 (or 6141 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 649133838 is about 25478.1050708250. The cubic root of 649133838 is about 865.8541633322.

The spelling of 649133838 in words is "six hundred forty-nine million, one hundred thirty-three thousand, eight hundred thirty-eight".