1028259557 has 8 divisors (see below), whose sum is σ = 1110854136. Its totient is φ = 946164672.

The previous prime is 1028259539. The next prime is 1028259577. The reversal of 1028259557 is 7559528201.

It can be written as a sum of positive squares in 4 ways, for example, as 92756161 + 935503396 = 9631^2 + 30586^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1028259557 - 2²⁶ = 961150693 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 (1028259577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120638 + ... + 128879.

It is an arithmetic number, because the mean of its divisors is an integer number (138856767).

Almost surely, 2^1028259557 is an apocalyptic number.

It is an amenable number.

1028259557 is a deficient number, since it is larger than the sum of its proper divisors (82594579).

1028259557 is a wasteful number, since it uses less digits than its factorization.

1028259557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249847.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1028259557 is about 32066.4865085029. The cubic root of 1028259557 is about 1009.3324860980.

The spelling of 1028259557 in words is "one billion, twenty-eight million, two hundred fifty-nine thousand, five hundred fifty-seven".