1089085816 has 64 divisors (see below), whose sum is σ = 2523487680. Its totient is φ = 429096960.

The previous prime is 1089085813. The next prime is 1089085853. The reversal of 1089085816 is 6185809801.

It is a super-2 number, since 2×1089085816² = 2372215829224771712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089085813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184186 + ... + 190006.

It is an arithmetic number, because the mean of its divisors is an integer number (39429495).

Almost surely, 2^1089085816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1089085816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261743840).

1089085816 is an abundant number, since it is smaller than the sum of its proper divisors (1434401864).

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

1089085816 is a wasteful number, since it uses less digits than its factorization.

1089085816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104 (or 6100 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 1089085816 is about 33001.3002168096. The cubic root of 1089085816 is about 1028.8546718550.

The spelling of 1089085816 in words is "one billion, eighty-nine million, eighty-five thousand, eight hundred sixteen".