2191386288 has 80 divisors (see below), whose sum is σ = 6967498496. Its totient is φ = 577946880.

The previous prime is 2191386271. The next prime is 2191386289. The reversal of 2191386288 is 8826831912.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (2191386289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246478 + ... + 255213.

Almost surely, 2^2191386288 is an apocalyptic number.

2191386288 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2191386288 is an abundant number, since it is smaller than the sum of its proper divisors (4776112208).

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

2191386288 is a wasteful number, since it uses less digits than its factorization.

2191386288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501722 (or 501716 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 2191386288 is about 46812.2450647264. The cubic root of 2191386288 is about 1298.8918145698.

The spelling of 2191386288 in words is "two billion, one hundred ninety-one million, three hundred eighty-six thousand, two hundred eighty-eight".