1128400065 has 80 divisors (see below), whose sum is σ = 2199814848. Its totient is φ = 550053504.

The previous prime is 1128400061. The next prime is 1128400067. The reversal of 1128400065 is 5600048211.

1128400065 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 1128400065 - 2² = 1128400061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1128400061) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 562354 + ... + 564356.

Almost surely, 2^1128400065 is an apocalyptic number.

1128400065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1128400065 is a deficient number, since it is larger than the sum of its proper divisors (1071414783).

1128400065 is a wasteful number, since it uses less digits than its factorization.

1128400065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1128400065 is about 33591.6666005127. Note that the first 4 decimals coincide. The cubic root of 1128400065 is about 1041.0886237035.

Adding to 1128400065 its reverse (5600048211), we get a palindrome (6728448276).

The spelling of 1128400065 in words is "one billion, one hundred twenty-eight million, four hundred thousand, sixty-five".