2191329280 has 192 divisors, whose sum is σ = 6329232000. Its totient is φ = 711327744.

The previous prime is 2191329263. The next prime is 2191329281. The reversal of 2191329280 is 829231912.

It is not an unprimeable number, because it can be changed into a prime (2191329281) 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, 1361116 + ... + 1362724.

It is an arithmetic number, because the mean of its divisors is an integer number (32964750).

Almost surely, 2^2191329280 is an apocalyptic number.

2191329280 is a gapful number since it is divisible by the number (20) 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 2191329280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3164616000).

2191329280 is an abundant number, since it is smaller than the sum of its proper divisors (4137902720).

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

2191329280 is a wasteful number, since it uses less digits than its factorization.

2191329280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 2191329280 is about 46811.6361602540. The cubic root of 2191329280 is about 1298.8805510959.

The spelling of 2191329280 in words is "two billion, one hundred ninety-one million, three hundred twenty-nine thousand, two hundred eighty".