1028628603591 has 4 divisors (see below), whose sum is σ = 1371504804792. Its totient is φ = 685752402392.

The previous prime is 1028628603571. The next prime is 1028628603599. The reversal of 1028628603591 is 1953068268201.

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

It is a cyclic number.

It is not a de Polignac number, because 1028628603591 - 2¹⁰ = 1028628602567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028628603599) 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, 171438100596 + ... + 171438100601.

It is an arithmetic number, because the mean of its divisors is an integer number (342876201198).

Almost surely, 2^{1028628603591} is an apocalyptic number.

1028628603591 is a deficient number, since it is larger than the sum of its proper divisors (342876201201).

1028628603591 is an equidigital number, since it uses as much as digits as its factorization.

1028628603591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342876201200.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 1028628603591 in words is "one trillion, twenty-eight billion, six hundred twenty-eight million, six hundred three thousand, five hundred ninety-one".