646333446 has 64 divisors (see below), whose sum is σ = 1470283776. Its totient is φ = 187639200.

The previous prime is 646333417. The next prime is 646333447. The reversal of 646333446 is 644333646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646333447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209205 + ... + 212271.

It is an arithmetic number, because the mean of its divisors is an integer number (22973184).

Almost surely, 2^646333446 is an apocalyptic number.

646333446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 646333446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735141888).

646333446 is an abundant number, since it is smaller than the sum of its proper divisors (823950330).

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

646333446 is a wasteful number, since it uses less digits than its factorization.

646333446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217.

The product of its digits is 373248, while the sum is 39.

The square root of 646333446 is about 25423.0888367248. The cubic root of 646333446 is about 864.6072575275.

The spelling of 646333446 in words is "six hundred forty-six million, three hundred thirty-three thousand, four hundred forty-six".