643088 has 10 divisors (see below), whose sum is σ = 1246014. Its totient is φ = 321536.

The previous prime is 643087. The next prime is 643099. The reversal of 643088 is 880346.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 169744 = 688^2 + 412^2 .

It is a super-4 number, since 4×643088⁴ (a number of 24 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643088.

It is not an unprimeable number, because it can be changed into a prime (643081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20081 + ... + 20112.

2⁶⁴³⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

643088 is a deficient number, since it is larger than the sum of its proper divisors (602926).

643088 is a wasteful number, since it uses less digits than its factorization.

643088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40201 (or 40195 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 643088 is about 801.9276775371. The cubic root of 643088 is about 86.3157672438.

The spelling of 643088 in words is "six hundred forty-three thousand, eighty-eight".