643025790 has 80 divisors (see below), whose sum is σ = 1886235120. Its totient is φ = 155882880.

The previous prime is 643025737. The next prime is 643025821. The reversal of 643025790 is 97520346.

643025790 is a `hidden beast` number, since 643 + 0 + 2 + 5 + 7 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27175 + ... + 44994.

It is an arithmetic number, because the mean of its divisors is an integer number (23577939).

Almost surely, 2^643025790 is an apocalyptic number.

643025790 is an abundant number, since it is smaller than the sum of its proper divisors (1243209330).

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

643025790 is a wasteful number, since it uses less digits than its factorization.

643025790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72199 (or 72190 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 643025790 is about 25357.9531902715. The cubic root of 643025790 is about 863.1298386266.

The spelling of 643025790 in words is "six hundred forty-three million, twenty-five thousand, seven hundred ninety".