643230725 has 6 divisors (see below), whose sum is σ = 797606130. Its totient is φ = 514584560.

The previous prime is 643230697. The next prime is 643230733. The reversal of 643230725 is 527032346.

It can be written as a sum of positive squares in 3 ways, for example, as 45819361 + 597411364 = 6769^2 + 24442^2 .

It is not a de Polignac number, because 643230725 - 2¹⁰ = 643229701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643230691 and 643230700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12864590 + ... + 12864639.

It is an arithmetic number, because the mean of its divisors is an integer number (132934355).

Almost surely, 2^643230725 is an apocalyptic number.

It is an amenable number.

643230725 is a deficient number, since it is larger than the sum of its proper divisors (154375405).

643230725 is a wasteful number, since it uses less digits than its factorization.

643230725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25729239 (or 25729234 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 643230725 is about 25361.9937110630. The cubic root of 643230725 is about 863.2215232465.

The spelling of 643230725 in words is "six hundred forty-three million, two hundred thirty thousand, seven hundred twenty-five".