646037338 has 8 divisors (see below), whose sum is σ = 969164532. Its totient is φ = 322982496.

The previous prime is 646037333. The next prime is 646037339. The reversal of 646037338 is 833730646.

It can be written as a sum of positive squares in 2 ways, for example, as 625850289 + 20187049 = 25017^2 + 4493^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 646037338.

It is not an unprimeable number, because it can be changed into a prime (646037333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22056 + ... + 42172.

Almost surely, 2^646037338 is an apocalyptic number.

646037338 is a deficient number, since it is larger than the sum of its proper divisors (323127194).

646037338 is a wasteful number, since it uses less digits than its factorization.

646037338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36176.

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 646037338 is about 25417.2645656451. The cubic root of 646037338 is about 864.4752017318.

The spelling of 646037338 in words is "six hundred forty-six million, thirty-seven thousand, three hundred thirty-eight".