646457 has 12 divisors (see below), whose sum is σ = 766080. Its totient is φ = 543816.

The previous prime is 646453. The next prime is 646519. The reversal of 646457 is 754646.

It is not a de Polignac number, because 646457 - 2² = 646453 is a prime.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646457.

It is not an unprimeable number, because it can be changed into a prime (646453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3788 + ... + 3954.

It is an arithmetic number, because the mean of its divisors is an integer number (63840).

2⁶⁴⁶⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

646457 is a deficient number, since it is larger than the sum of its proper divisors (119623).

646457 is a wasteful number, since it uses less digits than its factorization.

646457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 253 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 646457 is about 804.0254971081. The cubic root of 646457 is about 86.4662347192.

The spelling of 646457 in words is "six hundred forty-six thousand, four hundred fifty-seven".