1128980778 has 32 divisors (see below), whose sum is σ = 2455406784. Its totient is φ = 344616192.

The previous prime is 1128980777. The next prime is 1128980819. The reversal of 1128980778 is 8770898211.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128980778.

It is not an unprimeable number, because it can be changed into a prime (1128980773) 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 15 ways as a sum of consecutive naturals, for example, 145800 + ... + 153347.

It is an arithmetic number, because the mean of its divisors is an integer number (76731462).

Almost surely, 2^1128980778 is an apocalyptic number.

1128980778 is an abundant number, since it is smaller than the sum of its proper divisors (1326426006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1128980778 is a wasteful number, since it uses less digits than its factorization.

1128980778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299206.

The product of its (nonzero) digits is 451584, while the sum is 51.

The square root of 1128980778 is about 33600.3091950059. The cubic root of 1128980778 is about 1041.2671862644.

The spelling of 1128980778 in words is "one billion, one hundred twenty-eight million, nine hundred eighty thousand, seven hundred seventy-eight".