1028657493 has 12 divisors (see below), whose sum is σ = 1487016960. Its totient is φ = 685227816.

The previous prime is 1028657491. The next prime is 1028657501. The reversal of 1028657493 is 3947568201.

1028657493 is a `hidden beast` number, since 102 + 8 + 6 + 57 + 493 = 666.

1028657493 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028657493 - 2¹ = 1028657491 is a prime.

1028657493 is strictly pandigital in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028657491) 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 11 ways as a sum of consecutive naturals, for example, 33171 + ... + 56192.

It is an arithmetic number, because the mean of its divisors is an integer number (123918080).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1028657493 = 2057314986, but 3⋅1028657493 = 3085972479 is not.

Almost surely, 2^1028657493 is an apocalyptic number.

It is an amenable number.

1028657493 is a deficient number, since it is larger than the sum of its proper divisors (458359467).

1028657493 is a wasteful number, since it uses less digits than its factorization.

1028657493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90648 (or 90645 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1028657493 is about 32072.6907664449. The cubic root of 1028657493 is about 1009.4626730493.

The spelling of 1028657493 in words is "one billion, twenty-eight million, six hundred fifty-seven thousand, four hundred ninety-three".