1128732978 has 16 divisors (see below), whose sum is σ = 2260218816. Its totient is φ = 375785520.

The previous prime is 1128732907. The next prime is 1128732991. The reversal of 1128732978 is 8792378211.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 109353 + ... + 119228.

It is an arithmetic number, because the mean of its divisors is an integer number (141263676).

Almost surely, 2^1128732978 is an apocalyptic number.

1128732978 is an abundant number, since it is smaller than the sum of its proper divisors (1131485838).

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

1128732978 is a wasteful number, since it uses less digits than its factorization.

1128732978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229409.

The product of its digits is 338688, while the sum is 48.

The square root of 1128732978 is about 33596.6215265762. The cubic root of 1128732978 is about 1041.1909981090.

The spelling of 1128732978 in words is "one billion, one hundred twenty-eight million, seven hundred thirty-two thousand, nine hundred seventy-eight".