646464016 has 20 divisors (see below), whose sum is σ = 1366390224. Its totient is φ = 293847200.

The previous prime is 646464011. The next prime is 646464019. The reversal of 646464016 is 610464646.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (646464011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1836370 + ... + 1836721.

Almost surely, 2^646464016 is an apocalyptic number.

It is an amenable number.

646464016 is an abundant number, since it is smaller than the sum of its proper divisors (719926208).

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

646464016 is a wasteful number, since it uses less digits than its factorization.

646464016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673110 (or 3673104 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 646464016 is about 25425.6566483542. The cubic root of 646464016 is about 864.6654752422.

The spelling of 646464016 in words is "six hundred forty-six million, four hundred sixty-four thousand, sixteen".