643386454 has 8 divisors (see below), whose sum is σ = 1021849128. Its totient is φ = 302770080.

The previous prime is 643386421. The next prime is 643386467. The reversal of 643386454 is 454683346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×643386454² = 827892258381388232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643386454.

It is a congruent number.

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, 9461532 + ... + 9461599.

It is an arithmetic number, because the mean of its divisors is an integer number (127731141).

Almost surely, 2^643386454 is an apocalyptic number.

643386454 is a deficient number, since it is larger than the sum of its proper divisors (378462674).

643386454 is a wasteful number, since it uses less digits than its factorization.

643386454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18923150.

The product of its digits is 829440, while the sum is 43.

The square root of 643386454 is about 25365.0636506199. The cubic root of 643386454 is about 863.2911808733.

The spelling of 643386454 in words is "six hundred forty-three million, three hundred eighty-six thousand, four hundred fifty-four".