1028191647 has 24 divisors (see below), whose sum is σ = 1596000000. Its totient is φ = 587076336.

The previous prime is 1028191639. The next prime is 1028191649. The reversal of 1028191647 is 7461918201.

It is not a de Polignac number, because 1028191647 - 2³ = 1028191639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028191649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292104 + ... + 295602.

It is an arithmetic number, because the mean of its divisors is an integer number (66500000).

Almost surely, 2^1028191647 is an apocalyptic number.

1028191647 is a deficient number, since it is larger than the sum of its proper divisors (567808353).

1028191647 is a wasteful number, since it uses less digits than its factorization.

1028191647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5515 (or 5508 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1028191647 is about 32065.4275973360. The cubic root of 1028191647 is about 1009.3102656130.

The spelling of 1028191647 in words is "one billion, twenty-eight million, one hundred ninety-one thousand, six hundred forty-seven".