1089808902 has 144 divisors (see below), whose sum is σ = 3132616032. Its totient is φ = 270466560.

The previous prime is 1089808873. The next prime is 1089808903. The reversal of 1089808902 is 2098089801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089808903) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 192127 + ... + 197717.

It is an arithmetic number, because the mean of its divisors is an integer number (21754278).

Almost surely, 2^1089808902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1089808902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566308016).

1089808902 is an abundant number, since it is smaller than the sum of its proper divisors (2042807130).

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

1089808902 is a wasteful number, since it uses less digits than its factorization.

1089808902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643 (or 5633 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1089808902 is about 33012.2538158181. The cubic root of 1089808902 is about 1029.0823202225.

The spelling of 1089808902 in words is "one billion, eighty-nine million, eight hundred eight thousand, nine hundred two".