643793234 has 32 divisors (see below), whose sum is σ = 1138838400. Its totient is φ = 267212160.

The previous prime is 643793231. The next prime is 643793239. The reversal of 643793234 is 432397346.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 643793191 and 643793200.

It is not an unprimeable number, because it can be changed into a prime (643793231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75752 + ... + 83820.

It is an arithmetic number, because the mean of its divisors is an integer number (35588700).

Almost surely, 2^643793234 is an apocalyptic number.

643793234 is a deficient number, since it is larger than the sum of its proper divisors (495045166).

643793234 is a wasteful number, since it uses less digits than its factorization.

643793234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258.

The product of its digits is 326592, while the sum is 41.

The square root of 643793234 is about 25373.0808929464. The cubic root of 643793234 is about 863.4730806743.

The spelling of 643793234 in words is "six hundred forty-three million, seven hundred ninety-three thousand, two hundred thirty-four".