1028628493 has 2 divisors, whose sum is σ = 1028628494. Its totient is φ = 1028628492.

The previous prime is 1028628451. The next prime is 1028628539. The reversal of 1028628493 is 3948268201.

1028628493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642977449 + 385651044 = 25357^2 + 19638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028628493 is a prime.

It is a super-2 number, since 2×1028628493² = 2116153153222902098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028628443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514314246 + 514314247.

It is an arithmetic number, because the mean of its divisors is an integer number (514314247).

Almost surely, 2^1028628493 is an apocalyptic number.

It is an amenable number.

1028628493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028628493 is an equidigital number, since it uses as much as digits as its factorization.

1028628493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 1028628493 is about 32072.2386652382. The cubic root of 1028628493 is about 1009.4531866742.

The spelling of 1028628493 in words is "one billion, twenty-eight million, six hundred twenty-eight thousand, four hundred ninety-three".