1128772281 has 48 divisors (see below), whose sum is σ = 1903070400. Its totient is φ = 589825152.

The previous prime is 1128772277. The next prime is 1128772301. The reversal of 1128772281 is 1822778211.

1128772281 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1128772281 - 2² = 1128772277 is a prime.

It is a super-2 number, since 2×1128772281² = 2548253724707885922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1128772201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205590 + ... + 211008.

It is an arithmetic number, because the mean of its divisors is an integer number (39647300).

Almost surely, 2^1128772281 is an apocalyptic number.

It is an amenable number.

1128772281 is a deficient number, since it is larger than the sum of its proper divisors (774298119).

1128772281 is a wasteful number, since it uses less digits than its factorization.

1128772281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558 (or 5551 counting only the distinct ones).

The product of its digits is 25088, while the sum is 39.

The square root of 1128772281 is about 33597.2064463699. The cubic root of 1128772281 is about 1041.2030828847.

The spelling of 1128772281 in words is "one billion, one hundred twenty-eight million, seven hundred seventy-two thousand, two hundred eighty-one".