1128611640 has 128 divisors (see below), whose sum is σ = 3860861760. Its totient is φ = 261464064.

The previous prime is 1128611639. The next prime is 1128611651. The reversal of 1128611640 is 461168211.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1128611598 and 1128611607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5242 + ... + 47798.

Almost surely, 2^1128611640 is an apocalyptic number.

1128611640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128611640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1930430880).

1128611640 is an abundant number, since it is smaller than the sum of its proper divisors (2732250120).

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

1128611640 is a wasteful number, since it uses less digits than its factorization.

1128611640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42601 (or 42597 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1128611640 is about 33594.8156714693. The cubic root of 1128611640 is about 1041.1536876724.

Adding to 1128611640 its reverse (461168211), we get a palindrome (1589779851).

The spelling of 1128611640 in words is "one billion, one hundred twenty-eight million, six hundred eleven thousand, six hundred forty".