646270656 has 56 divisors (see below), whose sum is σ = 1718974464. Its totient is φ = 214283520.

The previous prime is 646270649. The next prime is 646270673. The reversal of 646270656 is 656072646.

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, 27861 + ... + 45483.

Almost surely, 2^646270656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646270656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859487232).

646270656 is an abundant number, since it is smaller than the sum of its proper divisors (1072703808).

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

646270656 is a wasteful number, since it uses less digits than its factorization.

646270656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17829 (or 17819 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 646270656 is about 25421.8539056458. The cubic root of 646270656 is about 864.5792583329.

The spelling of 646270656 in words is "six hundred forty-six million, two hundred seventy thousand, six hundred fifty-six".