646401912 has 32 divisors (see below), whose sum is σ = 1740313680. Its totient is φ = 198892800.

The previous prime is 646401911. The next prime is 646401947. The reversal of 646401912 is 219104646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646401911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1035589 + ... + 1036212.

Almost surely, 2^646401912 is an apocalyptic number.

It is an amenable number.

646401912 is an abundant number, since it is smaller than the sum of its proper divisors (1093911768).

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

646401912 is a wasteful number, since it uses less digits than its factorization.

646401912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071823 (or 2071819 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 646401912 is about 25424.4353329627. The cubic root of 646401912 is about 864.6377856864.

The spelling of 646401912 in words is "six hundred forty-six million, four hundred one thousand, nine hundred twelve".