643455142 has 16 divisors (see below), whose sum is σ = 1067352912. Its totient is φ = 288472320.

The previous prime is 643455097. The next prime is 643455167. The reversal of 643455142 is 241554346.

It is a junction number, because it is equal to n+sod(n) for n = 643455098 and 643455107.

It is a congruent number.

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, 198723 + ... + 201934.

It is an arithmetic number, because the mean of its divisors is an integer number (66709557).

Almost surely, 2^643455142 is an apocalyptic number.

643455142 is a deficient number, since it is larger than the sum of its proper divisors (423897770).

643455142 is a wasteful number, since it uses less digits than its factorization.

643455142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400743.

The product of its digits is 57600, while the sum is 34.

The square root of 643455142 is about 25366.4176028071. The cubic root of 643455142 is about 863.3219014634.

The spelling of 643455142 in words is "six hundred forty-three million, four hundred fifty-five thousand, one hundred forty-two".