1123456728 has 16 divisors (see below), whose sum is σ = 2808641880. Its totient is φ = 374485568.

The previous prime is 1123456727. The next prime is 1123456729. The reversal of 1123456728 is 8276543211.

It is an interprime number because it is at equal distance from previous prime (1123456727) and next prime (1123456729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123456727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23405325 + ... + 23405372.

Almost surely, 2^1123456728 is an apocalyptic number.

It is an amenable number.

1123456728 is an abundant number, since it is smaller than the sum of its proper divisors (1685185152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1123456728 is a wasteful number, since it uses less digits than its factorization.

1123456728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46810706 (or 46810702 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 1123456728 is about 33518.0060266120. The cubic root of 1123456728 is about 1039.5661183220.

Adding to 1123456728 its reverse (8276543211), we get a palindrome (9399999939).

The spelling of 1123456728 in words is "one billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred twenty-eight".