2187897687128 has 32 divisors (see below), whose sum is σ = 4297485672000. Its totient is φ = 1042856505600.

The previous prime is 2187897687127. The next prime is 2187897687149. The reversal of 2187897687128 is 8217867987812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187897687127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59668973 + ... + 59705628.

It is an arithmetic number, because the mean of its divisors is an integer number (134296427250).

Almost surely, 2^{2187897687128} is an apocalyptic number.

It is an amenable number.

2187897687128 is a deficient number, since it is larger than the sum of its proper divisors (2109587984872).

2187897687128 is a wasteful number, since it uses less digits than its factorization.

2187897687128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119374715 (or 119374711 counting only the distinct ones).

The product of its digits is 303464448, while the sum is 74.

The spelling of 2187897687128 in words is "two trillion, one hundred eighty-seven billion, eight hundred ninety-seven million, six hundred eighty-seven thousand, one hundred twenty-eight".