1028863 has 8 divisors (see below), whose sum is σ = 1133136. Its totient is φ = 934120.

The previous prime is 1028843. The next prime is 1028873. The reversal of 1028863 is 3688201.

1028863 = T₄₂₇ + T₄₂₈ + ... + T₄₃₇.

It is a de Polignac number, because none of the positive numbers 2^k-1028863 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945 + ... + 1717.

It is an arithmetic number, because the mean of its divisors is an integer number (141642).

2^1028863 is an apocalyptic number.

1028863 is a deficient number, since it is larger than the sum of its proper divisors (104273).

1028863 is an frugal number, since it uses more digits than its factorization.

1028863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1028863 is about 1014.3288421414. The cubic root of 1028863 is about 100.9529892648.

It can be divided in two parts, 1028 and 863, that added together give a triangular number (1891 = T₆₁).

The spelling of 1028863 in words is "one million, twenty-eight thousand, eight hundred sixty-three".