646222408 has 32 divisors (see below), whose sum is σ = 1308504960. Its totient is φ = 297426240.

The previous prime is 646222403. The next prime is 646222417. The reversal of 646222408 is 804222646.

It is not an unprimeable number, because it can be changed into a prime (646222403) 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, 29703 + ... + 46633.

It is an arithmetic number, because the mean of its divisors is an integer number (40890780).

Almost surely, 2^646222408 is an apocalyptic number.

It is an amenable number.

646222408 is an abundant number, since it is smaller than the sum of its proper divisors (662282552).

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

646222408 is a wasteful number, since it uses less digits than its factorization.

646222408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317 (or 17313 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 646222408 is about 25420.9049406192. The cubic root of 646222408 is about 864.5577424464.

The spelling of 646222408 in words is "six hundred forty-six million, two hundred twenty-two thousand, four hundred eight".