646275712 has 32 divisors (see below), whose sum is σ = 1343486880. Its totient is φ = 309086976.

The previous prime is 646275703. The next prime is 646275731. The reversal of 646275712 is 217572646.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×646275712² = 835344591842213888, which contains 22 as substring.

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, 106818 + ... + 112705.

It is an arithmetic number, because the mean of its divisors is an integer number (41983965).

Almost surely, 2^646275712 is an apocalyptic number.

It is an amenable number.

646275712 is an abundant number, since it is smaller than the sum of its proper divisors (697211168).

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

646275712 is a wasteful number, since it uses less digits than its factorization.

646275712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219560 (or 219548 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 646275712 is about 25421.9533474515. The cubic root of 646275712 is about 864.5815129617.

The spelling of 646275712 in words is "six hundred forty-six million, two hundred seventy-five thousand, seven hundred twelve".