2191285428 has 48 divisors (see below), whose sum is σ = 5405736000. Its totient is φ = 688946688.

The previous prime is 2191285403. The next prime is 2191285433. The reversal of 2191285428 is 8245821912.

It is a self number, because there is not a number n which added to its sum of digits gives 2191285428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31228 + ... + 73196.

It is an arithmetic number, because the mean of its divisors is an integer number (112619500).

Almost surely, 2^2191285428 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 2191285428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2702868000).

2191285428 is an abundant number, since it is smaller than the sum of its proper divisors (3214450572).

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

2191285428 is a wasteful number, since it uses less digits than its factorization.

2191285428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42224 (or 42222 counting only the distinct ones).

The product of its digits is 92160, while the sum is 42.

The square root of 2191285428 is about 46811.1677700952. The cubic root of 2191285428 is about 1298.8718868131.

The spelling of 2191285428 in words is "two billion, one hundred ninety-one million, two hundred eighty-five thousand, four hundred twenty-eight".