2190787856 has 60 divisors (see below), whose sum is σ = 4617450000. Its totient is φ = 1004132160.

The previous prime is 2190787847. The next prime is 2190787867. The reversal of 2190787856 is 6587870912.

It is a junction number, because it is equal to n+sod(n) for n = 2190787798 and 2190787807.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288395 + ... + 295893.

It is an arithmetic number, because the mean of its divisors is an integer number (76957500).

Almost surely, 2^2190787856 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 2190787856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308725000).

2190787856 is an abundant number, since it is smaller than the sum of its proper divisors (2426662144).

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

2190787856 is a wasteful number, since it uses less digits than its factorization.

2190787856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7588 (or 7551 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 2190787856 is about 46805.8527964185. The cubic root of 2190787856 is about 1298.7735683866.

The spelling of 2190787856 in words is "two billion, one hundred ninety million, seven hundred eighty-seven thousand, eight hundred fifty-six".