1089155868 has 24 divisors (see below), whose sum is σ = 2546237568. Its totient is φ = 362355696.

The previous prime is 1089155789. The next prime is 1089155909. The reversal of 1089155868 is 8685519801.

It is a self number, because there is not a number n which added to its sum of digits gives 1089155868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80496 + ... + 93047.

It is an arithmetic number, because the mean of its divisors is an integer number (106093232).

Almost surely, 2^1089155868 is an apocalyptic number.

It is an amenable number.

1089155868 is an abundant number, since it is smaller than the sum of its proper divisors (1457081700).

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

1089155868 is a wasteful number, since it uses less digits than its factorization.

1089155868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174073 (or 174071 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 51.

The square root of 1089155868 is about 33002.3615518647. The cubic root of 1089155868 is about 1028.8767306561.

The spelling of 1089155868 in words is "one billion, eighty-nine million, one hundred fifty-five thousand, eight hundred sixty-eight".