1028856580 has 12 divisors (see below), whose sum is σ = 2160598860. Its totient is φ = 411542624.

The previous prime is 1028856557. The next prime is 1028856601. The reversal of 1028856580 is 856588201.

It can be written as a sum of positive squares in 2 ways, for example, as 513384964 + 515471616 = 22658^2 + 22704^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25721395 + ... + 25721434.

It is an arithmetic number, because the mean of its divisors is an integer number (180049905).

Almost surely, 2^1028856580 is an apocalyptic number.

1028856580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028856580 is an abundant number, since it is smaller than the sum of its proper divisors (1131742280).

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

1028856580 is a wasteful number, since it uses less digits than its factorization.

1028856580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51442838 (or 51442836 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 43.

The square root of 1028856580 is about 32075.7943003755. The cubic root of 1028856580 is about 1009.5277928560.

The spelling of 1028856580 in words is "one billion, twenty-eight million, eight hundred fifty-six thousand, five hundred eighty".