2187899560 has 128 divisors (see below), whose sum is σ = 6154444800. Its totient is φ = 680060160.

The previous prime is 2187899543. The next prime is 2187899561. The reversal of 2187899560 is 659987812.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (2187899561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1474579 + ... + 1476061.

It is an arithmetic number, because the mean of its divisors is an integer number (48081600).

Almost surely, 2^2187899560 is an apocalyptic number.

2187899560 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 2187899560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3077222400).

2187899560 is an abundant number, since it is smaller than the sum of its proper divisors (3966545240).

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

2187899560 is a wasteful number, since it uses less digits than its factorization.

2187899560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991 (or 1987 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 55.

The square root of 2187899560 is about 46774.9886157121. The cubic root of 2187899560 is about 1298.2025573346.

The spelling of 2187899560 in words is "two billion, one hundred eighty-seven million, eight hundred ninety-nine thousand, five hundred sixty".