646420672 has 28 divisors (see below), whose sum is σ = 1326977280. Its totient is φ = 312064256.

The previous prime is 646420667. The next prime is 646420771. The reversal of 646420672 is 276024646.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172288 + ... + 175999.

Almost surely, 2^646420672 is an apocalyptic number.

It is an amenable number.

646420672 is an abundant number, since it is smaller than the sum of its proper divisors (680556608).

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

646420672 is a wasteful number, since it uses less digits than its factorization.

646420672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348328 (or 348318 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 646420672 is about 25424.8042666999. The cubic root of 646420672 is about 864.6461501666.

It can be divided in two parts, 64 and 6420672, that added together give a triangular number (6420736 = T₃₅₈₃).

The spelling of 646420672 in words is "six hundred forty-six million, four hundred twenty thousand, six hundred seventy-two".