1028256767 has 4 divisors (see below), whose sum is σ = 1028333280. Its totient is φ = 1028180256.

The previous prime is 1028256737. The next prime is 1028256769. The reversal of 1028256767 is 7676528201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7676528201 = 29 ⋅264707869.

It is a cyclic number.

It is not a de Polignac number, because 1028256767 - 2⁶ = 1028256703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028256769) 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, 12167 + ... + 46952.

It is an arithmetic number, because the mean of its divisors is an integer number (257083320).

Almost surely, 2^1028256767 is an apocalyptic number.

1028256767 is a deficient number, since it is larger than the sum of its proper divisors (76513).

1028256767 is an equidigital number, since it uses as much as digits as its factorization.

1028256767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76512.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 1028256767 is about 32066.4430051105. The cubic root of 1028256767 is about 1009.3315732156.

The spelling of 1028256767 in words is "one billion, twenty-eight million, two hundred fifty-six thousand, seven hundred sixty-seven".