1128723761 has 12 divisors (see below), whose sum is σ = 1275269424. Its totient is φ = 990721200.

The previous prime is 1128723691. The next prime is 1128723763. The reversal of 1128723761 is 1673278211.

It is not a de Polignac number, because 1128723761 - 2¹⁰ = 1128722737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128723763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51755 + ... + 70256.

It is an arithmetic number, because the mean of its divisors is an integer number (106272452).

Almost surely, 2^1128723761 is an apocalyptic number.

1128723761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1128723761 is a deficient number, since it is larger than the sum of its proper divisors (146545663).

1128723761 is a wasteful number, since it uses less digits than its factorization.

1128723761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122080 (or 122051 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 1128723761 is about 33596.4843547655. The cubic root of 1128723761 is about 1041.1881640511.

The spelling of 1128723761 in words is "one billion, one hundred twenty-eight million, seven hundred twenty-three thousand, seven hundred sixty-one".