2187648820 has 24 divisors (see below), whose sum is σ = 5250357504. Its totient is φ = 750050976.

The previous prime is 2187648811. The next prime is 2187648823. The reversal of 2187648820 is 288467812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187648823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7812892 + ... + 7813171.

It is an arithmetic number, because the mean of its divisors is an integer number (218764896).

Almost surely, 2^2187648820 is an apocalyptic number.

2187648820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187648820 is an abundant number, since it is smaller than the sum of its proper divisors (3062708684).

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

2187648820 is a wasteful number, since it uses less digits than its factorization.

2187648820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15626079 (or 15626077 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 46.

The square root of 2187648820 is about 46772.3082603371. The cubic root of 2187648820 is about 1298.1529627751.

The spelling of 2187648820 in words is "two billion, one hundred eighty-seven million, six hundred forty-eight thousand, eight hundred twenty".