646030440 has 384 divisors, whose sum is σ = 2462503680. Its totient is φ = 145305600.

The previous prime is 646030367. The next prime is 646030453. The reversal of 646030440 is 44030646.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3734194 + ... + 3734366.

It is an arithmetic number, because the mean of its divisors is an integer number (6412770).

Almost surely, 2^646030440 is an apocalyptic number.

646030440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646030440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231251840).

646030440 is an abundant number, since it is smaller than the sum of its proper divisors (1816473240).

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

646030440 is a wasteful number, since it uses less digits than its factorization.

646030440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 646030440 is about 25417.1288701143. The cubic root of 646030440 is about 864.4721249379.

The spelling of 646030440 in words is "six hundred forty-six million, thirty thousand, four hundred forty".