1028705906 has 4 divisors (see below), whose sum is σ = 1543058862. Its totient is φ = 514352952.

The previous prime is 1028705879. The next prime is 1028705939. The reversal of 1028705906 is 6095078201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1011558025 + 17147881 = 31805^2 + 4141^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1028705906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257176475 + ... + 257176478.

Almost surely, 2^1028705906 is an apocalyptic number.

1028705906 is a deficient number, since it is larger than the sum of its proper divisors (514352956).

1028705906 is an equidigital number, since it uses as much as digits as its factorization.

1028705906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514352955.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1028705906 is about 32073.4454962357. The cubic root of 1028705906 is about 1009.4785093376.

The spelling of 1028705906 in words is "one billion, twenty-eight million, seven hundred five thousand, nine hundred six".