646100420 has 24 divisors (see below), whose sum is σ = 1550641344. Its totient is φ = 221520096.

The previous prime is 646100387. The next prime is 646100431. The reversal of 646100420 is 24001646.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2307362 + ... + 2307641.

It is an arithmetic number, because the mean of its divisors is an integer number (64610056).

Almost surely, 2^646100420 is an apocalyptic number.

It is an amenable number.

646100420 is an abundant number, since it is smaller than the sum of its proper divisors (904540924).

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

646100420 is a wasteful number, since it uses less digits than its factorization.

646100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615019 (or 4615017 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 646100420 is about 25418.5054635397. The cubic root of 646100420 is about 864.5033379021.

The spelling of 646100420 in words is "six hundred forty-six million, one hundred thousand, four hundred twenty".