1089178636 has 72 divisors (see below), whose sum is σ = 2440458720. Its totient is φ = 415973376.

The previous prime is 1089178603. The next prime is 1089178669. The reversal of 1089178636 is 6368719801.

It is an interprime number because it is at equal distance from previous prime (1089178603) and next prime (1089178669).

It is a super-2 number, since 2×1089178636² = 2372620202237640992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1089178636.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133260 + ... + 141196.

It is an arithmetic number, because the mean of its divisors is an integer number (33895260).

Almost surely, 2^1089178636 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 1089178636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220229360).

1089178636 is an abundant number, since it is smaller than the sum of its proper divisors (1351280084).

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

1089178636 is a wasteful number, since it uses less digits than its factorization.

1089178636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8003 (or 7988 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1089178636 is about 33002.7064950740. The cubic root of 1089178636 is about 1028.8838999092.

The spelling of 1089178636 in words is "one billion, eighty-nine million, one hundred seventy-eight thousand, six hundred thirty-six".