646368458 has 16 divisors (see below), whose sum is σ = 1028138184. Its totient is φ = 303713280.

The previous prime is 646368439. The next prime is 646368473. The reversal of 646368458 is 854863646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 646023889 + 344569 = 25417^2 + 587^2 .

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, 8978 + ... + 37058.

Almost surely, 2^646368458 is an apocalyptic number.

646368458 is a deficient number, since it is larger than the sum of its proper divisors (381769726).

646368458 is a wasteful number, since it uses less digits than its factorization.

646368458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28777.

The product of its digits is 3317760, while the sum is 50.

The square root of 646368458 is about 25423.7774140665. Note that the first 3 decimals coincide. The cubic root of 646368458 is about 864.6228692229.

The spelling of 646368458 in words is "six hundred forty-six million, three hundred sixty-eight thousand, four hundred fifty-eight".