646224100 has 36 divisors (see below), whose sum is σ = 1463281344. Its totient is φ = 247250080.

The previous prime is 646224097. The next prime is 646224107. The reversal of 646224100 is 1422646.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (646224107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138184 + ... + 142783.

It is an arithmetic number, because the mean of its divisors is an integer number (40646704).

Almost surely, 2^646224100 is an apocalyptic number.

It is an amenable number.

646224100 is an abundant number, since it is smaller than the sum of its proper divisors (817057244).

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

646224100 is a wasteful number, since it uses less digits than its factorization.

646224100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281004 (or 280997 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 646224100 is about 25420.9382202939. The cubic root of 646224100 is about 864.5584970011.

Adding to 646224100 its reverse (1422646), we get a palindrome (647646746).

The spelling of 646224100 in words is "six hundred forty-six million, two hundred twenty-four thousand, one hundred".