2191707072 has 140 divisors (see below), whose sum is σ = 6550030080. Its totient is φ = 724598784.

The previous prime is 2191707059. The next prime is 2191707079. The reversal of 2191707072 is 2707071912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191707079) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 656704 + ... + 660032.

Almost surely, 2^2191707072 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 2191707072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3275015040).

2191707072 is an abundant number, since it is smaller than the sum of its proper divisors (4358323008).

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

2191707072 is a wasteful number, since it uses less digits than its factorization.

2191707072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480 (or 3461 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 2191707072 is about 46815.6712223589. The cubic root of 2191707072 is about 1298.9551904922.

Adding to 2191707072 its reverse (2707071912), we get a palindrome (4898778984).

The spelling of 2191707072 in words is "two billion, one hundred ninety-one million, seven hundred seven thousand, seventy-two".