1128456779 has 4 divisors (see below), whose sum is σ = 1134185184. Its totient is φ = 1122728376.

The previous prime is 1128456757. The next prime is 1128456781. The reversal of 1128456779 is 9776548211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1128456779 - 2⁸ = 1128456523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128456799) 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, 2863907 + ... + 2864300.

It is an arithmetic number, because the mean of its divisors is an integer number (283546296).

Almost surely, 2^1128456779 is an apocalyptic number.

1128456779 is a deficient number, since it is larger than the sum of its proper divisors (5728405).

1128456779 is an equidigital number, since it uses as much as digits as its factorization.

1128456779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5728404.

The product of its digits is 846720, while the sum is 50.

The square root of 1128456779 is about 33592.5107576079. The cubic root of 1128456779 is about 1041.1060653044.

The spelling of 1128456779 in words is "one billion, one hundred twenty-eight million, four hundred fifty-six thousand, seven hundred seventy-nine".