1028135868 has 12 divisors (see below), whose sum is σ = 2398983720. Its totient is φ = 342711952.

The previous prime is 1028135861. The next prime is 1028135873. The reversal of 1028135868 is 8685318201.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1028135868² = 2114126726136226848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028135861) 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, 42838983 + ... + 42839006.

It is an arithmetic number, because the mean of its divisors is an integer number (199915310).

Almost surely, 2^1028135868 is an apocalyptic number.

It is an amenable number.

1028135868 is an abundant number, since it is smaller than the sum of its proper divisors (1370847852).

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

1028135868 is a wasteful number, since it uses less digits than its factorization.

1028135868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85677996 (or 85677994 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 1028135868 is about 32064.5578170041. The cubic root of 1028135868 is about 1009.2920137189.

The spelling of 1028135868 in words is "one billion, twenty-eight million, one hundred thirty-five thousand, eight hundred sixty-eight".