1123557778 has 32 divisors (see below), whose sum is σ = 2042264448. Its totient is φ = 452563200.

The previous prime is 1123557767. The next prime is 1123557779. The reversal of 1123557778 is 8777553211.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1123557779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190108 + ... + 195928.

It is an arithmetic number, because the mean of its divisors is an integer number (63820764).

Almost surely, 2^1123557778 is an apocalyptic number.

1123557778 is a deficient number, since it is larger than the sum of its proper divisors (918706670).

1123557778 is a wasteful number, since it uses less digits than its factorization.

1123557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6658.

The product of its digits is 411600, while the sum is 46.

The square root of 1123557778 is about 33519.5133914560. The cubic root of 1123557778 is about 1039.5972855236.

The spelling of 1123557778 in words is "one billion, one hundred twenty-three million, five hundred fifty-seven thousand, seven hundred seventy-eight".