1028439657 has 24 divisors (see below), whose sum is σ = 1787098560. Its totient is φ = 556748640.

The previous prime is 1028439649. The next prime is 1028439697. The reversal of 1028439657 is 7569348201.

1028439657 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 1028439657 - 2³ = 1028439649 is a prime.

1028439657 is strictly pandigital in base 10.

It is not an unprimeable number, because it can be changed into a prime (1028439697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 428394 + ... + 430787.

It is an arithmetic number, because the mean of its divisors is an integer number (74462440).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1028439657 = 2056879314, but 3⋅1028439657 = 3085318971 is not.

Almost surely, 2^1028439657 is an apocalyptic number.

It is an amenable number.

1028439657 is a deficient number, since it is larger than the sum of its proper divisors (758658903).

1028439657 is a wasteful number, since it uses less digits than its factorization.

1028439657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859213 (or 859210 counting only the distinct ones).

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

The square root of 1028439657 is about 32069.2946133837. The cubic root of 1028439657 is about 1009.3914109637.

The spelling of 1028439657 in words is "one billion, twenty-eight million, four hundred thirty-nine thousand, six hundred fifty-seven".