643143354 has 32 divisors (see below), whose sum is σ = 1556516736. Its totient is φ = 172945920.

The previous prime is 643143317. The next prime is 643143377. The reversal of 643143354 is 453341346.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449667 + ... + 451094.

It is an arithmetic number, because the mean of its divisors is an integer number (48641148).

Almost surely, 2^643143354 is an apocalyptic number.

643143354 is an abundant number, since it is smaller than the sum of its proper divisors (913373382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643143354 is a wasteful number, since it uses less digits than its factorization.

643143354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900790.

The product of its digits is 51840, while the sum is 33.

The square root of 643143354 is about 25360.2711736290. The cubic root of 643143354 is about 863.1824372494.

The spelling of 643143354 in words is "six hundred forty-three million, one hundred forty-three thousand, three hundred fifty-four".