1028638847 has 4 divisors (see below), whose sum is σ = 1033053840. Its totient is φ = 1024223856.

The previous prime is 1028638811. The next prime is 1028638859. The reversal of 1028638847 is 7488368201.

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

It is a cyclic number.

It is not a de Polignac number, because 1028638847 - 2¹⁰ = 1028637823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028628847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207147 + ... + 2207612.

It is an arithmetic number, because the mean of its divisors is an integer number (258263460).

Almost surely, 2^1028638847 is an apocalyptic number.

1028638847 is a deficient number, since it is larger than the sum of its proper divisors (4414993).

1028638847 is an equidigital number, since it uses as much as digits as its factorization.

1028638847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414992.

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 1028638847 is about 32072.4000816902. The cubic root of 1028638847 is about 1009.4565736577.

The spelling of 1028638847 in words is "one billion, twenty-eight million, six hundred thirty-eight thousand, eight hundred forty-seven".