1281989088 has 144 divisors (see below), whose sum is σ = 3843141120. Its totient is φ = 404566272.

The previous prime is 1281989081. The next prime is 1281989101. The reversal of 1281989088 is 8809891821.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281989081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681333 + ... + 683211.

It is an arithmetic number, because the mean of its divisors is an integer number (26688480).

Almost surely, 2^1281989088 is an apocalyptic number.

1281989088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281989088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1921570560).

1281989088 is an abundant number, since it is smaller than the sum of its proper divisors (2561152032).

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

1281989088 is a wasteful number, since it uses less digits than its factorization.

1281989088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2010 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 54.

The square root of 1281989088 is about 35804.8751987771. The cubic root of 1281989088 is about 1086.3291738433.

The spelling of 1281989088 in words is "one billion, two hundred eighty-one million, nine hundred eighty-nine thousand, eighty-eight".