1028657 has 8 divisors (see below), whose sum is σ = 1200000. Its totient is φ = 881412.

The previous prime is 1028647. The next prime is 1028663. The reversal of 1028657 is 7568201.

It is not a de Polignac number, because 1028657 - 2¹⁶ = 963121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157 + ... + 1842.

It is an arithmetic number, because the mean of its divisors is an integer number (150000).

2^1028657 is an apocalyptic number.

It is an amenable number.

1028657 is a deficient number, since it is larger than the sum of its proper divisors (171343).

1028657 is an frugal number, since it uses more digits than its factorization.

1028657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020 (or 3006 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1028657 is about 1014.2272920800. The cubic root of 1028657 is about 100.9462511782.

The spelling of 1028657 in words is "one million, twenty-eight thousand, six hundred fifty-seven".