1028785590 has 128 divisors (see below), whose sum is σ = 3300480000. Its totient is φ = 222766848.

The previous prime is 1028785573. The next prime is 1028785613. The reversal of 1028785590 is 955878201.

It is a happy number.

1028785590 is a `hidden beast` number, since 1 + 0 + 28 + 78 + 559 + 0 = 666.

1028785590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21586 + ... + 50234.

It is an arithmetic number, because the mean of its divisors is an integer number (25785000).

Almost surely, 2^1028785590 is an apocalyptic number.

1028785590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028785590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650240000).

1028785590 is an abundant number, since it is smaller than the sum of its proper divisors (2271694410).

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

1028785590 is a wasteful number, since it uses less digits than its factorization.

1028785590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28691 (or 28685 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 1028785590 is about 32074.6876835925. The cubic root of 1028785590 is about 1009.5045735438.

The spelling of 1028785590 in words is "one billion, twenty-eight million, seven hundred eighty-five thousand, five hundred ninety".