643000026 has 8 divisors (see below), whose sum is σ = 1286000064. Its totient is φ = 214333340.

The previous prime is 642999989. The next prime is 643000031. The reversal of 643000026 is 620000346.

It is a sphenic number, since it is the product of 3 distinct primes.

643000026 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 642999966 and 643000011.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53583330 + ... + 53583341.

It is an arithmetic number, because the mean of its divisors is an integer number (160750008).

Almost surely, 2^643000026 is an apocalyptic number.

643000026 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

643000026 is a wasteful number, since it uses less digits than its factorization.

643000026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107166676.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 643000026 is about 25357.4451788819. The cubic root of 643000026 is about 863.1183108494.

The spelling of 643000026 in words is "six hundred forty-three million, twenty-six", and thus it is an aban number.