2187995520 has 128 divisors (see below), whose sum is σ = 7277610240. Its totient is φ = 558086144.

The previous prime is 2187995507. The next prime is 2187995533. The reversal of 2187995520 is 255997812.

It is an interprime number because it is at equal distance from previous prime (2187995507) and next prime (2187995533).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 2187995520.

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, 19387 + ... + 68933.

It is an arithmetic number, because the mean of its divisors is an integer number (56856330).

Almost surely, 2^2187995520 is an apocalyptic number.

2187995520 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 2187995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3638805120).

2187995520 is an abundant number, since it is smaller than the sum of its proper divisors (5089614720).

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

2187995520 is a wasteful number, since it uses less digits than its factorization.

2187995520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49592 (or 49580 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 2187995520 is about 46776.0143663395. The cubic root of 2187995520 is about 1298.2215365264.

The spelling of 2187995520 in words is "two billion, one hundred eighty-seven million, nine hundred ninety-five thousand, five hundred twenty".