1288090116 has 36 divisors (see below), whose sum is σ = 3267144972. Its totient is φ = 427894464.

The previous prime is 1288090109. The next prime is 1288090117. The reversal of 1288090116 is 6110908821.

It can be written as a sum of positive squares in 2 ways, for example, as 1204367616 + 83722500 = 34704^2 + 9150^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1288090116² = 3318352293873786912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1288090117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50511 + ... + 71606.

It is an arithmetic number, because the mean of its divisors is an integer number (90754027).

Almost surely, 2^1288090116 is an apocalyptic number.

It is an amenable number.

1288090116 is an abundant number, since it is smaller than the sum of its proper divisors (1979054856).

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

1288090116 is a wasteful number, since it uses less digits than its factorization.

1288090116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122420 (or 122415 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1288090116 is about 35889.9723599782. The cubic root of 1288090116 is about 1088.0497393369.

Adding to 1288090116 its reverse (6110908821), we get a palindrome (7398998937).

The spelling of 1288090116 in words is "one billion, two hundred eighty-eight million, ninety thousand, one hundred sixteen".