646004229 has 16 divisors (see below), whose sum is σ = 940306752. Its totient is φ = 392093568.

The previous prime is 646004209. The next prime is 646004239. The reversal of 646004229 is 922400646.

It is a happy number.

It is not a de Polignac number, because 646004229 - 2⁸ = 646003973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646004229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646004209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110607 + ... + 116300.

It is an arithmetic number, because the mean of its divisors is an integer number (58769172).

Almost surely, 2^646004229 is an apocalyptic number.

It is an amenable number.

646004229 is a deficient number, since it is larger than the sum of its proper divisors (294302523).

646004229 is a wasteful number, since it uses less digits than its factorization.

646004229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226996.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 646004229 is about 25416.6132480313. The cubic root of 646004229 is about 864.4604335459.

The spelling of 646004229 in words is "six hundred forty-six million, four thousand, two hundred twenty-nine".