1028021666 has 24 divisors (see below), whose sum is σ = 1796074560. Its totient is φ = 440020392.

The previous prime is 1028021623. The next prime is 1028021677. The reversal of 1028021666 is 6661208201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75971 + ... + 88473.

It is an arithmetic number, because the mean of its divisors is an integer number (74836440).

Almost surely, 2^1028021666 is an apocalyptic number.

1028021666 is a deficient number, since it is larger than the sum of its proper divisors (768052894).

1028021666 is a wasteful number, since it uses less digits than its factorization.

1028021666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13358 (or 13351 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1028021666 is about 32062.7769539695. The cubic root of 1028021666 is about 1009.2546427066.

Adding to 1028021666 its reverse (6661208201), we get a palindrome (7689229867).

The spelling of 1028021666 in words is "one billion, twenty-eight million, twenty-one thousand, six hundred sixty-six".