1028561833 has 4 divisors (see below), whose sum is σ = 1107681988. Its totient is φ = 949441680.

The previous prime is 1028561819. The next prime is 1028561837. The reversal of 1028561833 is 3381658201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162613504 + 865948329 = 12752^2 + 29427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028561833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1028561792 and 1028561801.

It is not an unprimeable number, because it can be changed into a prime (1028561837) 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, 39560058 + ... + 39560083.

It is an arithmetic number, because the mean of its divisors is an integer number (276920497).

Almost surely, 2^1028561833 is an apocalyptic number.

1028561833 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1028561833 is a deficient number, since it is larger than the sum of its proper divisors (79120155).

1028561833 is an equidigital number, since it uses as much as digits as its factorization.

1028561833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79120154.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1028561833 is about 32071.1994318890. The cubic root of 1028561833 is about 1009.4313804200.

The spelling of 1028561833 in words is "one billion, twenty-eight million, five hundred sixty-one thousand, eight hundred thirty-three".