643044146 has 4 divisors (see below), whose sum is σ = 964566222. Its totient is φ = 321522072.

The previous prime is 643044131. The next prime is 643044169. The reversal of 643044146 is 641440346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 437437225 + 205606921 = 20915^2 + 14339^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160761035 + ... + 160761038.

Almost surely, 2^643044146 is an apocalyptic number.

643044146 is a deficient number, since it is larger than the sum of its proper divisors (321522076).

643044146 is a wasteful number, since it uses less digits than its factorization.

643044146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321522075.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 643044146 is about 25358.3151254179. The cubic root of 643044146 is about 863.1380515997.

The spelling of 643044146 in words is "six hundred forty-three million, forty-four thousand, one hundred forty-six".