649646933 has 8 divisors (see below), whose sum is σ = 700185528. Its totient is φ = 599189184.

The previous prime is 649646911. The next prime is 649646939. The reversal of 649646933 is 339646946.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 194379364 + 455267569 = 13942^2 + 21337^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649646933 - 2⁶ = 649646869 is a prime.

It is a super-2 number, since 2×649646933² = 844082275112612978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649646939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2966 + ... + 36167.

It is an arithmetic number, because the mean of its divisors is an integer number (87523191).

Almost surely, 2^649646933 is an apocalyptic number.

It is an amenable number.

649646933 is a deficient number, since it is larger than the sum of its proper divisors (50538595).

649646933 is a wasteful number, since it uses less digits than its factorization.

649646933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40423.

The product of its digits is 2519424, while the sum is 50.

The square root of 649646933 is about 25488.1724138864. The cubic root of 649646933 is about 866.0822356822.

The spelling of 649646933 in words is "six hundred forty-nine million, six hundred forty-six thousand, nine hundred thirty-three".