643272426 has 12 divisors (see below), whose sum is σ = 1393756962. Its totient is φ = 214424136.

The previous prime is 643272397. The next prime is 643272439. The reversal of 643272426 is 624272346.

643272426 is a `hidden beast` number, since 643 + 2 + 7 + 2 + 4 + 2 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 559275201 + 83997225 = 23649^2 + 9165^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17868661 + ... + 17868696.

Almost surely, 2^643272426 is an apocalyptic number.

643272426 is an abundant number, since it is smaller than the sum of its proper divisors (750484536).

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

643272426 is a wasteful number, since it uses less digits than its factorization.

643272426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35737365 (or 35737362 counting only the distinct ones).

The product of its digits is 96768, while the sum is 36.

The square root of 643272426 is about 25362.8158137065. The cubic root of 643272426 is about 863.2401772180.

The spelling of 643272426 in words is "six hundred forty-three million, two hundred seventy-two thousand, four hundred twenty-six".