1028247557 has 4 divisors (see below), whose sum is σ = 1034404896. Its totient is φ = 1022090220.

The previous prime is 1028247551. The next prime is 1028247589. The reversal of 1028247557 is 7557428201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7557428201 = 19 ⋅397759379.

It is a cyclic number.

It is not a de Polignac number, because 1028247557 - 2²⁸ = 759812101 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 (1028247551) 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 3 ways as a sum of consecutive naturals, for example, 3078419 + ... + 3078752.

It is an arithmetic number, because the mean of its divisors is an integer number (258601224).

Almost surely, 2^1028247557 is an apocalyptic number.

It is an amenable number.

1028247557 is a deficient number, since it is larger than the sum of its proper divisors (6157339).

1028247557 is an equidigital number, since it uses as much as digits as its factorization.

1028247557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6157338.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 1028247557 is about 32066.2993967187. The cubic root of 1028247557 is about 1009.3285597103.

The spelling of 1028247557 in words is "one billion, twenty-eight million, two hundred forty-seven thousand, five hundred fifty-seven".