646957456 has 20 divisors (see below), whose sum is σ = 1259849052. Its totient is φ = 321835136.

The previous prime is 646957411. The next prime is 646957459. The reversal of 646957456 is 654759646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 419430400 + 227527056 = 20480^2 + 15084^2 .

It is not an unprimeable number, because it can be changed into a prime (646957459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99475 + ... + 105778.

Almost surely, 2^646957456 is an apocalyptic number.

It is an amenable number.

646957456 is a deficient number, since it is larger than the sum of its proper divisors (612891596).

646957456 is a wasteful number, since it uses less digits than its factorization.

646957456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205458 (or 205452 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 52.

The square root of 646957456 is about 25435.3583815916. The cubic root of 646957456 is about 864.8854163434.

The spelling of 646957456 in words is "six hundred forty-six million, nine hundred fifty-seven thousand, four hundred fifty-six".