1028509866 has 32 divisors (see below), whose sum is σ = 2308219200. Its totient is φ = 339440400.

The previous prime is 1028509861. The next prime is 1028509871. The reversal of 1028509866 is 6689058201.

It is an interprime number because it is at equal distance from previous prime (1028509861) and next prime (1028509871).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1028509861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88836 + ... + 99743.

It is an arithmetic number, because the mean of its divisors is an integer number (72131850).

Almost surely, 2^1028509866 is an apocalyptic number.

1028509866 is an abundant number, since it is smaller than the sum of its proper divisors (1279709334).

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

1028509866 is a wasteful number, since it uses less digits than its factorization.

1028509866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188691 (or 188685 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1028509866 is about 32070.3892399204. The cubic root of 1028509866 is about 1009.4143799823.

The spelling of 1028509866 in words is "one billion, twenty-eight million, five hundred nine thousand, eight hundred sixty-six".