2189863620 has 192 divisors, whose sum is σ = 8196249600. Its totient is φ = 474180480.

The previous prime is 2189863609. The next prime is 2189863651. The reversal of 2189863620 is 263689812.

2189863620 is a `hidden beast` number, since 2 + 1 + 8 + 9 + 8 + 636 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56575 + ... + 87065.

It is an arithmetic number, because the mean of its divisors is an integer number (42688800).

Almost surely, 2^2189863620 is an apocalyptic number.

2189863620 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 2189863620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4098124800).

2189863620 is an abundant number, since it is smaller than the sum of its proper divisors (6006385980).

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

2189863620 is a wasteful number, since it uses less digits than its factorization.

2189863620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30535 (or 30527 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 2189863620 is about 46795.9786733860. The cubic root of 2189863620 is about 1298.5909031830.

The spelling of 2189863620 in words is "two billion, one hundred eighty-nine million, eight hundred sixty-three thousand, six hundred twenty".