1125687778 has 16 divisors (see below), whose sum is σ = 1762603704. Its totient is φ = 538652160.

The previous prime is 1125687757. The next prime is 1125687791. The reversal of 1125687778 is 8777865211.

It can be written as a sum of positive squares in 4 ways, for example, as 969512769 + 156175009 = 31137^2 + 12497^2 .

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, 120175 + ... + 129202.

Almost surely, 2^1125687778 is an apocalyptic number.

1125687778 is a deficient number, since it is larger than the sum of its proper divisors (636915926).

1125687778 is a wasteful number, since it uses less digits than its factorization.

1125687778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249477.

The product of its digits is 1317120, while the sum is 52.

The square root of 1125687778 is about 33551.2708850201. The cubic root of 1125687778 is about 1040.2538144070.

The spelling of 1125687778 in words is "one billion, one hundred twenty-five million, six hundred eighty-seven thousand, seven hundred seventy-eight".