1129276778 has 16 divisors (see below), whose sum is σ = 1988225664. Its totient is φ = 470895120.

The previous prime is 1129276751. The next prime is 1129276789. The reversal of 1129276778 is 8776729211.

It is a happy number.

It is a super-2 number, since 2×1129276778² = 2550532082660122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089518 + ... + 1090553.

It is an arithmetic number, because the mean of its divisors is an integer number (124264104).

Almost surely, 2^1129276778 is an apocalyptic number.

1129276778 is a deficient number, since it is larger than the sum of its proper divisors (858948886).

1129276778 is a wasteful number, since it uses less digits than its factorization.

1129276778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180117.

The product of its digits is 592704, while the sum is 50.

The square root of 1129276778 is about 33604.7136277041. The cubic root of 1129276778 is about 1041.3581792972.

The spelling of 1129276778 in words is "one billion, one hundred twenty-nine million, two hundred seventy-six thousand, seven hundred seventy-eight".