1028656693 has 4 divisors (see below), whose sum is σ = 1036756480. Its totient is φ = 1020556908.

The previous prime is 1028656687. The next prime is 1028656729. The reversal of 1028656693 is 3966568201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3966568201 = 23 ⋅172459487.

It is a cyclic number.

It is not a de Polignac number, because 1028656693 - 2¹⁷ = 1028525621 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 (1028656633) 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, 4049703 + ... + 4049956.

It is an arithmetic number, because the mean of its divisors is an integer number (259189120).

Almost surely, 2^1028656693 is an apocalyptic number.

It is an amenable number.

1028656693 is a deficient number, since it is larger than the sum of its proper divisors (8099787).

1028656693 is an equidigital number, since it uses as much as digits as its factorization.

1028656693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099786.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 1028656693 is about 32072.6782947730. The cubic root of 1028656693 is about 1009.4624113586.

It can be divided in two parts, 1028 and 656693, that added together give a square (657721 = 811²).

The spelling of 1028656693 in words is "one billion, twenty-eight million, six hundred fifty-six thousand, six hundred ninety-three".