643061136 has 40 divisors (see below), whose sum is σ = 1677382720. Its totient is φ = 212270976.

The previous prime is 643061131. The next prime is 643061143. The reversal of 643061136 is 631160346.

It is a super-2 number, since 2×643061136² = 827055249267220992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643061131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60091 + ... + 69978.

It is an arithmetic number, because the mean of its divisors is an integer number (41934568).

Almost surely, 2^643061136 is an apocalyptic number.

It is an amenable number.

643061136 is an abundant number, since it is smaller than the sum of its proper divisors (1034321584).

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

643061136 is a wasteful number, since it uses less digits than its factorization.

643061136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130183 (or 130177 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 643061136 is about 25358.6501218026. The cubic root of 643061136 is about 863.1456532480.

The spelling of 643061136 in words is "six hundred forty-three million, sixty-one thousand, one hundred thirty-six".