1191660288 has 432 divisors, whose sum is σ = 4216853760. Its totient is φ = 290783232.

The previous prime is 1191660227. The next prime is 1191660293. The reversal of 1191660288 is 8820661911.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20197603 + ... + 20197661.

Almost surely, 2^1191660288 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 1191660288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2108426880).

1191660288 is an abundant number, since it is smaller than the sum of its proper divisors (3025193472).

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

1191660288 is a wasteful number, since it uses less digits than its factorization.

1191660288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1191660288 is about 34520.4329057444. The cubic root of 1191660288 is about 1060.1911035533.

The spelling of 1191660288 in words is "one billion, one hundred ninety-one million, six hundred sixty thousand, two hundred eighty-eight".