1089645136 has 20 divisors (see below), whose sum is σ = 2222303200. Its totient is φ = 516147552.

The previous prime is 1089645127. The next prime is 1089645163. The reversal of 1089645136 is 6315469801.

It is a junction number, because it is equal to n+sod(n) for n = 1089645092 and 1089645101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1791876 + ... + 1792483.

It is an arithmetic number, because the mean of its divisors is an integer number (111115160).

Almost surely, 2^1089645136 is an apocalyptic number.

1089645136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1089645136 is an abundant number, since it is smaller than the sum of its proper divisors (1132658064).

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

1089645136 is a wasteful number, since it uses less digits than its factorization.

1089645136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584386 (or 3584380 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1089645136 is about 33009.7733406335. The cubic root of 1089645136 is about 1029.0307707758.

The spelling of 1089645136 in words is "one billion, eighty-nine million, six hundred forty-five thousand, one hundred thirty-six".