646020456 has 32 divisors (see below), whose sum is σ = 1615809600. Its totient is φ = 215239040.

The previous prime is 646020449. The next prime is 646020461. The reversal of 646020456 is 654020646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60100 + ... + 70028.

It is an arithmetic number, because the mean of its divisors is an integer number (50494050).

Almost surely, 2^646020456 is an apocalyptic number.

It is an amenable number.

646020456 is an abundant number, since it is smaller than the sum of its proper divisors (969789144).

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

646020456 is a wasteful number, since it uses less digits than its factorization.

646020456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12649 (or 12645 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 646020456 is about 25416.9324663697. The cubic root of 646020456 is about 864.4676716213.

The spelling of 646020456 in words is "six hundred forty-six million, twenty thousand, four hundred fifty-six".