1028465281 has 4 divisors (see below), whose sum is σ = 1028943364. Its totient is φ = 1027987200.

The previous prime is 1028465261. The next prime is 1028465287. The reversal of 1028465281 is 1825648201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1825648201 = 13 ⋅140434477.

It can be written as a sum of positive squares in 2 ways, for example, as 586414656 + 442050625 = 24216^2 + 21025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028465281 - 2²⁵ = 994910849 is a prime.

It is a super-2 number, since 2×1028465281² = 2115481668444817922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028465281.

It is not an unprimeable number, because it can be changed into a prime (1028465287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235800 + ... + 240121.

It is an arithmetic number, because the mean of its divisors is an integer number (257235841).

Almost surely, 2^1028465281 is an apocalyptic number.

It is an amenable number.

1028465281 is a deficient number, since it is larger than the sum of its proper divisors (478083).

1028465281 is an equidigital number, since it uses as much as digits as its factorization.

1028465281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478082.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1028465281 is about 32069.6941207739. The cubic root of 1028465281 is about 1009.3997940291.

The spelling of 1028465281 in words is "one billion, twenty-eight million, four hundred sixty-five thousand, two hundred eighty-one".